Dermatology Differential Diagnosis by Morphology

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Infectious

1. Amebiasis
2. North American / South American blastomycosis - pustules
3. Leishmaniasis
4. TB verrucosa cutis - dry
5. Chromoblastomycosis - #2.
6. Candida gramuloma - mucocutaneous candidiasis
7. Granuloma inguinale - ulcerative
8. Condyloma acuminata
9. Atypical mycobacterium infection - "swimming pool or fish tank granuloma" - #2, #3
10. Norwegian scabies
11. Mycetoma

Neoplastic

1. Melanoma
2. Squamous cell carcinoma
3. Clear cell acanthoma
4. Keratoacanthoma

Other

1. Pemphigus vegetans - peripheral vesicles
2. Pyoderma vegetans of Hallopeau (dermatitis vegetans) - purulent
3. Darier's disease - dry, non-inflamed, characteristic distribution
4. Hailey - Hailey disease
5. Bowen's disease - superficial
6. Lipoid proteinasis - eyes and base of tongue
7. Elephantiasis nostra

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