| Nail | Psoriasis |
| Onychomycosis | |
| Alopecia areata | |
| Genital | Psoriasis |
| Seborrheic dermatitis | |
| Palms and soles | Secondary syphilis |
| Lichen planopilaris | Cicatricial alopecia |
| Lupus erythematosus | |
| Inflammatory folliculitis | |
| Alopecia areata | |
| Cicatricial pemphigoid | |
| Keratosis follicularis spinulosa decalvans | |
| Mucosal | Paraneoplastic pemphigus |
| Candidiasis | |
| Lupus erythematosus | |
| Leukokeratosis | |
| Secondary syphilis | |
| Traumatic patches |
Reference:
Fitzpatrick's Dermatology in General Medicine 7th Edition