Hyperpigmentation
Postinflammatory hyperpigmentation (acne, psoriasis, atopic and contact dermatitis, lichen planus, trauma, drugs, and fixed-drug eruptions)
Melasma
Solar lentigines
Ephelides (freckles)
Café-au-lait macules
Nevi
Melanoma and precursors
Hypopigmentation
Acquired (common)
Vitiligo
Pityriasis alba
Tinea versicolor
Postinflammatory hypopigmentation
Congenital (uncommon)
Albinism
Piebaldism
Tuberous sclerosis
Hypomelanosis of Ito