{"id":36880,"date":"2026-05-28T10:15:14","date_gmt":"2026-05-28T04:45:14","guid":{"rendered":"https:\/\/atsixty.com\/?p=36880"},"modified":"2026-05-30T07:56:56","modified_gmt":"2026-05-30T02:26:56","slug":"dermatology-histopathology-diagnostic-tests","status":"publish","type":"post","link":"https:\/\/atsixty.com\/index.php\/neet-pg\/dermatology-histopathology-diagnostic-tests\/","title":{"rendered":"Dermatology: Histopathology &amp; Diagnostic Tests"},"content":{"rendered":"\n\n\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400;1,600&#038;family=Source+Serif+4:ital,wght@0,300;0,400;0,600;1,400&#038;display=swap\" rel=\"stylesheet\">\n<style>\n\/* All styles namespaced to #dhis01 -- no bleed into WordPress theme *\/\n#dhis01 *,#dhis01 *::before,#dhis01 *::after{box-sizing:border-box;margin:0;padding:0}\n#dhis01{\n  --ter:#8B3D20;--ter-light:#B85A38;--ter-pale:#FDF0EB;--ter-dark:#6B2D14;\n  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Display',serif;font-size:0.92rem;font-weight:700;cursor:pointer}\n#dhis01 .mr-retry:hover{background:var(--ter);color:#FFFDF9}\n@media(max-width:480px){#dhis01 .mr-title{font-size:1.4rem}#dhis01 .mr-num{font-size:1.7rem}#dhis01 .mr-stem{font-size:0.9rem}#dhis01 .mr-opt-text{font-size:0.86rem}}\n<\/style>\n\n<div id=\"dhis01\">\n\n  <div class=\"mr-header\">\n    <div class=\"mr-eyebrow\">Morning Rounds &middot; Daily Clinical Quiz<\/div>\n    <div class=\"mr-title\">\n      Dermatology<br><em>Histopathology &amp; Diagnostic Tests<\/em>\n    <\/div>\n    <div class=\"mr-subtitle\">Five high-yield clinical cases &middot; +4 \/ &minus;1 scoring &middot; NEET-PG and INI-CET<\/div>\n    <div class=\"mr-chips\">\n      <span class=\"mr-chip\">5 Cases<\/span>\n      <span class=\"mr-chip\">+4 \/ &minus;1 scoring<\/span>\n      <span class=\"mr-chip\">Options reshuffled<\/span>\n    <\/div>\n  <\/div>\n\n  <div class=\"mr-sentinel\" id=\"dhis01-sentinel\"><\/div>\n\n  <div class=\"mr-progress\" id=\"dhis01-progress\">\n    <div class=\"mr-prog-inner\">\n      <div class=\"mr-pips\" id=\"dhis01-pips\"><\/div>\n    <\/div>\n  <\/div>\n\n  <div class=\"mr-body\">\n    <div id=\"dhis01-cases\"><\/div>\n    <div class=\"mr-submit-wrap\">\n      <button class=\"mr-btn\" id=\"dhis01-submit\">Submit for Debrief<\/button>\n    <\/div>\n    <div class=\"mr-score\" id=\"dhis01-score\">\n      <div class=\"mr-score-in\">\n        <div class=\"mr-score-ey\">Round Complete<\/div>\n        <div class=\"mr-ring\" id=\"dhis01-ring\">\n          <div class=\"mr-ring-in\">\n            <span class=\"mr-ring-pct\" id=\"dhis01-pct\">0%<\/span>\n            <span class=\"mr-ring-sub\">net<\/span>\n          <\/div>\n        <\/div>\n        <div class=\"mr-score-title\">Your Debrief<\/div>\n        <div class=\"mr-score-net\" id=\"dhis01-net\"><\/div>\n        <div class=\"mr-verdict\" id=\"dhis01-verdict\"><\/div>\n        <div class=\"mr-bands\">\n          <span class=\"mr-band mr-band-c\" id=\"dhis01-ct-c\"><\/span>\n          <span class=\"mr-band mr-band-w\" id=\"dhis01-ct-w\"><\/span>\n          <span class=\"mr-band mr-band-s\" id=\"dhis01-ct-s\"><\/span>\n        <\/div>\n        <button class=\"mr-retry\" id=\"dhis01-retry\">&#8635; New Round<\/button>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<script>\n(function () {\n  'use strict';\n\n  var NS    = 'dhis01';\n  var TOTAL = 5;\n  var MAX   = 20;\n  var LTRS  = ['A','B','C','D'];\n\n  \/* ================================================================\n     QUESTION BANK -- Dermatology: Histopathology & Diagnostic Tests\n     NEET-PG level.\n     ================================================================\n\n     Q1  TZANCK SMEAR (Easy)\n         Scraping from base of a fresh blister; stained with\n         Giemsa or Leishman.\n         Positive (acantholytic cells \/ Tzanck cells = multinucleate\n         giant cells) in:\n           - Herpes simplex (HSV-1, HSV-2)\n           - Herpes zoster (VZV)\n           - Pemphigus vulgaris (acantholytic cells without giant\n             cells -- no viral CPE)\n         NOT positive in:\n           - Bullous pemphigoid (no acantholysis)\n           - Dermatitis herpetiformis\n           - Impetigo\n         Multinucleate giant cells with nuclear moulding =\n           herpetic infections specifically.\n         Answer: Herpes simplex -- multinucleate giant cells with\n                 nuclear moulding on Tzanck smear; NOT positive\n                 in bullous pemphigoid\n\n     Q2  PATCH TEST (Medium)\n         Gold standard for allergic contact dermatitis (Type IV).\n         European baseline series applied to upper back for 48 hrs\n           under occlusion; read at 48 and 96 hours.\n         Grading: + = erythema + induration; ++ = vesicles;\n                  +++ = bullae; IR = irritant reaction (no induration,\n                  follicular pattern).\n         Most common positive allergen: nickel sulphate.\n         NOT to be confused with:\n           Prick test (Type I, IgE-mediated, read at 15-20 min).\n           Intradermal test (also Type I, more sensitive).\n           Scratch test (Type I, less standardised).\n         Patch test performed AWAY from active dermatitis and NOT\n           during systemic steroid therapy.\n         Answer: patch test -- Type IV hypersensitivity,\n                 read at 48 and 96 hours, gold standard for ACD;\n                 prick test for Type I (IgE-mediated)\n\n     Q3  WOOD LAMP -- MULTIPLE USES (Medium)\n         Emits long-wave UV (365 nm).\n         Fluorescence patterns:\n           Tinea versicolor (Malassezia): golden-yellow\n           Microsporum tinea capitis: bright green\n           Erythrasma (Corynebacterium minutissimum): coral-red\n             (due to porphyrin production)\n           Pseudomonas infection: yellow-green\n           Vitiligo: chalk-white\/ivory (enhanced contrast)\n           Tuberous sclerosis: ash-leaf macules (enhanced)\n         Non-fluorescent (on Wood lamp):\n           Trichophyton tinea capitis (endothrix -- no fluorescence)\n           Dermal melasma (not accentuated)\n           Pityriasis alba\n         Erythrasma: coral-red is the single most tested Wood lamp\n           finding; caused by Corynebacterium minutissimum in\n           intertriginous areas (axillae, groins, toe webs);\n           treated with topical erythromycin or oral erythromycin.\n         Answer: erythrasma -- coral-red fluorescence from\n                 Corynebacterium minutissimum porphyrins;\n                 Microsporum tinea capitis -- bright green\n\n     Q4  DERMOSCOPY -- BASIC PATTERNS (Medium)\n         Non-invasive in vivo technique; 10x magnification with\n         polarised or immersion light.\n         Key patterns for NEET-PG:\n           Melanocytic lesions:\n             Pigment network: regular (benign naevus) vs\n                              irregular\/atypical (melanoma suspect)\n             Blue-white veil: melanoma\n             Regression structures (white scar-like areas): melanoma\n           Basal cell carcinoma: arborising (tree-like) blood vessels,\n             blue-grey ovoid nests, spoke-wheel areas, leaf-like areas\n           Seborrhoeic keratosis: comedone-like openings, milia-like\n             cysts, fissures and ridges (brain-like surface)\n           Dermatofibroma: central white patch + peripheral pigment\n             network (ring-in-ring)\n           Scabies: jet with contrail sign (delta-wing\/jet aircraft)\n             = mite body (dark triangle) at end of burrow track\n         Answer: blue-white veil and irregular pigment network\n                 suggest melanoma; jet with contrail sign\n                 is pathognomonic of scabies on dermoscopy\n\n     Q5  PAS STAIN & KOH MOUNT -- FUNGAL DIAGNOSIS (Easy-Medium)\n         KOH (potassium hydroxide) mount:\n           Dissolves keratin, leaving fungal elements visible.\n           Dermatophytes: long branching septate hyphae +\n             arthrospores.\n           Tinea versicolor: spaghetti and meatballs\n             (short hyphae + round spores).\n           Candida: pseudohyphae + budding yeast cells.\n         PAS (Periodic Acid-Schiff) stain:\n           Stains fungal cell wall polysaccharides\n             (glycogen, mucopolysaccharides) magenta\/red.\n           Used on tissue sections (biopsy).\n           Also stains basement membrane, glycogen in cells.\n         India ink: Cryptococcus neoformans in CSF\n           (capsule appears as clear halo around yeast).\n         Gram stain: bacteria (not fungi).\n         Answer: PAS stain identifies fungi in tissue sections\n                 by staining cell wall polysaccharides magenta;\n                 KOH dissolves keratin for direct microscopy\n     ================================================================ *\/\n\n  var QS = [\n\n    \/* ---- Q1 : Tzanck Smear ---- *\/\n    {\n      id:      1,\n      tag:     'Dermatology Diagnostics &mdash; Tzanck Smear',\n      stem:    'A <strong>26-year-old woman<\/strong> presents with grouped vesicles on an erythematous base on her lip. The roof of a fresh vesicle is removed and the base is scraped. The smear is stained with Giemsa. Microscopy shows <strong>large multinucleate giant cells with nuclear moulding<\/strong>. Which of the following statements about this test is most accurate?',\n      correct: 'The Tzanck smear is positive in herpes simplex and herpes zoster; multinucleate giant cells with nuclear moulding are specific to herpetic infections; bullous pemphigoid gives a negative Tzanck smear',\n      opts: [\n        'The Tzanck smear is positive in herpes simplex and herpes zoster; multinucleate giant cells with nuclear moulding are specific to herpetic infections; bullous pemphigoid gives a negative Tzanck smear',\n        'The Tzanck smear is positive in bullous pemphigoid and dermatitis herpetiformis; giant cells indicate subepidermal blistering',\n        'The Tzanck smear is positive only in pemphigus vulgaris; acantholytic cells with nuclear moulding confirm the diagnosis',\n        'The Tzanck smear is the gold standard for diagnosing impetigo; neutrophil-filled bullae confirm staphylococcal infection'\n      ],\n      exp:     'The <strong>Tzanck smear<\/strong> is performed by scraping the base of a freshly opened vesicle or bulla, smearing it on a glass slide, and staining with Giemsa or Leishman. <strong>Positive results<\/strong> are seen in: <em>herpes simplex (HSV)<\/em>, <em>herpes zoster (VZV)<\/em>, and <em>pemphigus vulgaris<\/em>. In <strong>herpetic infections<\/strong>, the characteristic finding is <strong>multinucleate giant cells with nuclear moulding<\/strong> &mdash; virally infected keratinocytes fuse and their nuclei press against each other. In <strong>pemphigus vulgaris<\/strong>, Tzanck cells are seen but they are <em>acantholytic keratinocytes<\/em> without nuclear moulding (no viral cytopathic effect). <strong>Bullous pemphigoid is Tzanck negative<\/strong> &mdash; the split is subepidermal with no acantholysis, so no Tzanck cells form. <strong>Extra point:<\/strong> the Tzanck smear does <em>not<\/em> distinguish HSV-1 from HSV-2, nor HSV from VZV &mdash; it only confirms herpetic infection. For definitive typing, PCR or viral culture is required. Despite being over a century old, the Tzanck smear remains a rapid, bedside, low-cost test that is consistently examined at NEET-PG.'\n    },\n\n    \/* ---- Q2 : Patch Test ---- *\/\n    {\n      id:      2,\n      tag:     'Dermatology Diagnostics &mdash; Patch Test',\n      stem:    'A <strong>35-year-old jewellery worker<\/strong> has chronic eczema on her hands and neck. Her dermatologist performs a test by applying a battery of allergens to the upper back under occlusion for <strong>48 hours<\/strong>, with readings at 48 and 96 hours. One allergen produces erythema, induration, and vesicles at both readings. The test performed, the type of hypersensitivity it detects, and the most common positive allergen are:',\n      correct: 'Patch test; Type IV (delayed-type, cell-mediated) hypersensitivity; nickel sulphate is the most common positive allergen worldwide',\n      opts: [\n        'Patch test; Type IV (delayed-type, cell-mediated) hypersensitivity; nickel sulphate is the most common positive allergen worldwide',\n        'Prick test; Type I (IgE-mediated, immediate) hypersensitivity; house dust mite is the most common positive allergen',\n        'Intradermal test; Type III (immune complex) hypersensitivity; read at 6-8 hours for the Arthus reaction',\n        'Scratch test; Type II (cytotoxic) hypersensitivity; penicillin is the most common positive allergen'\n      ],\n      exp:     'The <strong>patch test<\/strong> is the gold standard for diagnosing <strong>allergic contact dermatitis (ACD)<\/strong>. It detects <strong>Type IV (delayed-type, cell-mediated) hypersensitivity<\/strong> &mdash; the reaction develops over 48&ndash;96 hours as sensitised T cells recognise the hapten-carrier complex. Grading: (+) erythema + papules; (++) vesicles; (+++) bullae. An <strong>irritant reaction (IR)<\/strong> shows erythema without induration, often with a follicular pattern, and fades by 96 hours (a positive allergic reaction <em>persists or intensifies<\/em> at 96 hours). <strong>Most common positive allergen:<\/strong> <strong>nickel sulphate<\/strong> (jewellery, watch straps, belt buckles). <strong>Important contrasts:<\/strong> the <em>prick test<\/em> (skin prick test) detects <strong>Type I IgE-mediated<\/strong> hypersensitivity &mdash; read at 15&ndash;20 minutes; used for atopy, food allergy, drug allergy. The patch test must NOT be performed during systemic corticosteroid therapy (false-negative) or on actively inflamed skin (false-positive). <strong>Extra point:<\/strong> the patch test must be read at <em>both<\/em> 48 and 96 hours &mdash; some allergens (e.g. corticosteroids themselves) show late reactions that are only positive at 96&ndash;120 hours and are missed by a single reading.'\n    },\n\n    \/* ---- Q3 : Wood Lamp ---- *\/\n    {\n      id:      3,\n      tag:     'Dermatology Diagnostics &mdash; Wood Lamp',\n      stem:    'A <strong>42-year-old obese man<\/strong> presents with <strong>well-defined, reddish-brown, slightly scaly patches<\/strong> in both axillae and groins with no significant itch. Wood lamp examination of the affected skin reveals a striking <strong>coral-red fluorescence<\/strong>. The causative organism, the reason for the fluorescence, and the treatment are:',\n      correct: 'Corynebacterium minutissimum; porphyrin production causes coral-red fluorescence; topical or oral erythromycin is the treatment of choice',\n      opts: [\n        'Corynebacterium minutissimum; porphyrin production causes coral-red fluorescence; topical or oral erythromycin is the treatment of choice',\n        'Malassezia furfur; azelaic acid production causes coral-red fluorescence; topical ketoconazole is the treatment of choice',\n        'Trichophyton rubrum; keratin degradation products cause coral-red fluorescence; oral terbinafine is the treatment of choice',\n        'Pseudomonas aeruginosa; pyocyanin pigment causes coral-red fluorescence; topical silver sulphadiazine is the treatment of choice'\n      ],\n      exp:     '<strong>Erythrasma<\/strong> is a superficial bacterial infection of intertriginous areas (axillae, groins, toe web spaces, submammary folds) caused by <strong>Corynebacterium minutissimum<\/strong>. The organism produces <strong>porphyrins<\/strong> (coproporphyrin III) that fluoresce <strong>coral-red<\/strong> under Wood lamp &mdash; this is the single most tested Wood lamp finding in NEET-PG. <strong>Treatment:<\/strong> topical erythromycin or clindamycin; oral erythromycin for extensive disease. <strong>Complete Wood lamp fluorescence summary for NEET-PG:<\/strong> <em>Tinea versicolor<\/em> &mdash; golden-yellow; <em>Microsporum<\/em> tinea capitis &mdash; bright green; <em>Erythrasma<\/em> &mdash; coral-red; <em>Pseudomonas<\/em> &mdash; yellow-green; <em>Vitiligo<\/em> &mdash; chalk-white (enhanced contrast); <em>Tuberous sclerosis<\/em> (ash-leaf macules) &mdash; white (enhanced). <strong>Non-fluorescent:<\/strong> Trichophyton tinea capitis, dermal melasma, pityriasis alba. <strong>Extra point:<\/strong> erythrasma is often misdiagnosed as tinea cruris. The distinction: tinea cruris has an active scaly advancing edge and responds to antifungals; erythrasma has a more uniform, less inflamed appearance and does not respond to antifungals. Wood lamp resolves the diagnosis immediately at the bedside.'\n    },\n\n    \/* ---- Q4 : Dermoscopy ---- *\/\n    {\n      id:      4,\n      tag:     'Dermatology Diagnostics &mdash; Dermoscopy',\n      stem:    'A <strong>55-year-old fair-skinned man<\/strong> presents with a pigmented lesion on his back. Dermoscopy shows an <strong>irregular pigment network, blue-white veil<\/strong>, and areas of regression (white scar-like structures). Separately, a <strong>9-year-old child<\/strong> with scabies undergoes dermoscopy of a burrow, which reveals a <strong>dark triangular structure at the end of a translucent track<\/strong>. The significance of the adult finding and the name of the paediatric dermoscopic sign are:',\n      correct: 'Irregular pigment network and blue-white veil are major dermoscopic features of melanoma; the triangular structure at the burrow tip is the jet with contrail sign (delta-wing sign), pathognomonic of scabies',\n      opts: [\n        'Irregular pigment network and blue-white veil are major dermoscopic features of melanoma; the triangular structure at the burrow tip is the jet with contrail sign (delta-wing sign), pathognomonic of scabies',\n        'Blue-white veil is diagnostic of basal cell carcinoma; the burrow structure represents a dermatofibroma with central white patch',\n        'Irregular pigment network indicates seborrhoeic keratosis with comedone-like openings; the triangular burrow tip is the milia-like cyst sign',\n        'Blue-white veil and regression confirm benign melanocytic naevus; the burrow structure is the arborising vessel pattern of BCC'\n      ],\n      exp:     '<strong>Dermoscopy<\/strong> (dermatoscopy) uses polarised or immersion light at 10x magnification to visualise subsurface skin structures invisible to the naked eye. <strong>Key melanoma features:<\/strong> <em>irregular\/atypical pigment network<\/em> (malignant vs regular network in benign naevus); <em>blue-white veil<\/em> (irregular blue-white diffuse area over a raised lesion = compacted melanin in dermis + orthokeratosis overlying it); <em>regression structures<\/em> (white scar-like areas + blue-grey peppering = partial tumour regression). <strong>Jet with contrail sign (delta-wing\/jet aircraft sign):<\/strong> the dark triangular structure is the <em>mite body<\/em> (the &ldquo;jet&rdquo;) at the end of the burrow track (the &ldquo;contrail&rdquo;) &mdash; pathognomonic of scabies on dermoscopy, allowing immediate bedside diagnosis without skin scraping. <strong>Extra point &mdash; other NEET-PG dermoscopy patterns:<\/strong> <em>Basal cell carcinoma<\/em>: arborising (tree-like) telangiectasia, blue-grey ovoid nests, leaf-like areas. <em>Seborrhoeic keratosis<\/em>: comedone-like openings, milia-like cysts, brain-like fissures and ridges. <em>Dermatofibroma<\/em>: central white patch surrounded by peripheral delicate pigment network (&ldquo;ring-in-ring&rdquo;). These four patterns &mdash; melanoma, BCC, SK, and dermatofibroma &mdash; cover the vast majority of dermoscopy questions at this level.'\n    },\n\n    \/* ---- Q5 : PAS Stain & KOH Mount ---- *\/\n    {\n      id:      5,\n      tag:     'Dermatology Diagnostics &mdash; PAS Stain &amp; KOH Mount',\n      stem:    'A <strong>50-year-old diabetic man<\/strong> has thickened, discoloured toenails and scaly skin in the toe web spaces. Skin scrapings are taken for direct microscopy after adding <strong>10% potassium hydroxide<\/strong>. A nail clipping is sent for <strong>histopathological examination<\/strong> and a special stain is requested. The purpose of each investigation and the stain used on the nail biopsy to identify fungal elements in tissue are:',\n      correct: 'KOH dissolves keratin to reveal fungal hyphae and spores on direct microscopy; PAS (Periodic Acid-Schiff) stain colours fungal cell wall polysaccharides magenta and is used on tissue sections',\n      opts: [\n        'KOH dissolves keratin to reveal fungal hyphae and spores on direct microscopy; PAS (Periodic Acid-Schiff) stain colours fungal cell wall polysaccharides magenta and is used on tissue sections',\n        'KOH kills bacteria to allow fungal culture; Gram stain identifies fungal elements in tissue by their positive staining',\n        'KOH dissolves the fungal cell wall to release spores for culture; India ink stain identifies dermatophytes in tissue by their clear capsule',\n        'KOH neutralises skin pH for accurate microscopy; silver methenamine (GMS) is the only stain that identifies fungi in tissue sections'\n      ],\n      exp:     '<strong>KOH (potassium hydroxide) mount<\/strong>: KOH dissolves keratin &mdash; the protein matrix of skin, hair, and nails &mdash; while leaving fungal cell walls intact, making hyphae and spores visible on direct microscopy. It is the standard bedside test for superficial fungal infections. Findings: <em>dermatophytes<\/em> = long branching septate hyphae + arthrospores; <em>Tinea versicolor<\/em> = short hyphae + round spores (spaghetti and meatballs); <em>Candida<\/em> = pseudohyphae + budding yeast. <strong>PAS (Periodic Acid-Schiff) stain<\/strong>: periodic acid oxidises polysaccharides (glycogen, mucopolysaccharides) in the fungal cell wall, which then react with Schiff reagent to produce a <strong>magenta\/red colour<\/strong>. Used on <em>tissue sections<\/em> (biopsies) to identify fungi histologically. Also stains the basement membrane and glycogen in cells. <strong>Extra point &mdash; stain summary for NEET-PG:<\/strong> <em>PAS<\/em> = fungi in tissue (magenta); <em>GMS (Grocott methenamine silver)<\/em> = fungi in tissue (black, more sensitive than PAS); <em>India ink<\/em> = Cryptococcus in CSF (clear halo capsule); <em>Gram stain<\/em> = bacteria (not fungi); <em>Ziehl-Neelsen<\/em> = mycobacteria (acid-fast). 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