Hypopigmentation is/are seen in:
B i.e. Pityriasis versicolor Pityriasis alba, pityriasis versicolor, pinta, yaws, syphilis (secondary syphilis - leukoderma syphiliticum), tuberculoid and indeterminate leprosyQ - all can cause hypopigmentation (hypomelanosis). A few papules or erythematosquamous plaques develop in primary stage of pinta which become more extensive in secondary stage (pintids) after an interval of months or years. Initial red color of pintids changes to brown, slate blue, black or grey, and eventually there is depigmentation intermixed with hyperpigmentation. Primary & secondary stages are infectious. In teiary (late) stage, which takes several years to develop, there is irregular pigmentation, vitiligo like achromia (hypopigmentation), areas of hyperkeratosis and eventually atrophy. Nonscaly, non itchy, transient (evanescent) macular syphilide (roseolar rash) of secondary syphilis is generalized, symmetrical, coppery red oval or round spots. Fading roseolar rash may sometimes, leave a pattern of depigmented spots on a hyperpigmented background (k/a leukoderma syphiliticum) most commonly located on the back or sides of neck (k/a necklace of venus). Melasma (mask of pregnancy) Vt hyperpigmentationQ. Lichen planus usually Vt hyperpigmentationQ. Lichen planus usually Vt hyperpigmentation but hypopigmentation may also occurQ.
Vitiligo
Pityriasis versicolor
Lichen planus
Melasma