Vitiligo
Tinea versicolor (pityriasis versicolor)
Postinflammatory hypopigmentation
Pityriasis alba
Idiopathic guttate hypomelanosis
Chemically induced (phenols)
Nevus depigmentosus
Halo nevi
Hypomelanosis of Ito
Seborrheic dermatitis
Intralesional corticosteroids
Morphea (localized scleroderma)
Piebaldism (white forelock)
Leukoderma
Tuberous sclerosis
Lichen sclerosis
Albinism
Leprosy
Liquid nitrogen treatment
Thinking Through the Differential Diagnosis
Postinflammatory hypopigmentation comes from things like “Tinea versicolor, atopic dermatitis, pityriasis alba, psoriasis, guttate parapsoriasis, dermabrasion, chemical peels, intralesional corticosteroid use”
Further Reading
Am Fam Physician. 2017;96(12):797-804. Pigmentation Disorders: Diagnosis and Management
Am Fam Physician. 2009 Jan 15;79(2):109-116. Common Pigmentation Disorders.