Dermatology Differential Diagnosis by Morphology

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1. Pityriasis rosea - More: #1, #2.
2. Psoriasis - More: #1, #2, #3. More examples at the Image Database.
3. Lichen planus - More: #1. More examples at the Image Database.
4. Pityriasis rubra pilaris - More: #2, #3, #4, #5, #6.
5. Parapsoriasis
6. Secondary syphilis ( Lues - L₂ ) - More: #1
7. Tinea versicolor
8. Tinea corporis - More: #1. More examples at the Image Database.
9. Seborrheic dermatitis - More: #1.
10. Drug reaction - lichenoid (e.g. atabrine, gold, isoniazid)

1. Lichen planus - More: #1. More examples at the Image Database.
2. Eczema (active)
3. Psoriasis - More: #1, #2, #3. More examples at the Image Database.
4. Auto-inoculation: Verruca, Molluscum contagiosum, etc.)

1. Adenoma sebaceum of Pringle
2. Basal cell carcinoma - More examples at the Image Database.
3. Intraepidermal nevus
4. Acrochordon
5. Dermatofibroma
6. Verruca vulgaris / plana
7. Molluscum contagiosum
8. Syringoma
9. Acne cyst
10. Hidrocystoma
    • Apocrine
    • Eccrine
11. Epithelioid inclusion cyst ("Sebaceous" cyst)
12. Epithelioma adenoides cystica / Trichoepithelioma
13. Neurofibroma
14. Nevus lipomatous superficialis
15. Nodular elastoidosis (with cysts and comedones) / (Favre - Racouchot syndrome)
16. Lichen amyloidosis
17. Lipoid proteinosis
18. Trichofolliculoma
19. Milia
20. Colloid milium
21. Metastatic lesions

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