Skin:
Inflammatory: atopic dermatitis, psoriasis, lichen planus, contact dermatitis, seborrheic dermatitis
 
Autoimmune connective tissue diseases: lupus erythematosus, dermatomyositis, systemic sclerosis, morphea, lichen sclerosus
 
Pigmentary disorders: vitiligo, albinism, melasma
 
Vascular: birthmarks

Infectious: bacterial, fungal, viral infections

Hair and Nails:

Hair: scarring and non scarring alopecia
 
Nails: inflammatory and infectious dermatoses