II. Causes: Patches or Plaques (Hypopigmentation)
- Pityriasis Alba
- Pityriasis Versicolor (Tinea Versicolor)
- Vitiligo
- Postinflammatory Hypopigmentation
- Cryotherapy
-
Corticosteroids
- Associated with prolonged potent Topical Corticosteroids, intraarticular or intradermal Corticosteroid Injections
- Hypopigmented patches with irregular borders
- Chemical Leukoderma
- Hypomelanosis due to chemical contact exposure (e.g. phenols, catechols)
- Household disinfectants and detergents
- Hydroquinone
- P-phenylenediamine (hair dyes)
- Chloroquine
- Tretinoin
- Metals (e.g. Arsenic, mercurials)
III. Causes: Papules
IV. Causes: Diffuse changes (congenital conditions, uncommon)
- Albinism
- Piebaldism
- Tuberous sclerosis
- Hypermelanosis of Ito