<prompt> Hypopigmentation isare seen in:VitiligoPityriasis versicolorLichen planusMelasma  <response>: 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 ka leukoderma syphiliticum most commonly located on the back or sides of neck ka necklace of venus. Melasma mask of pregnancy Vt hyperpigmentationQ. Lichen planus usually Vt hyperpigmentationQ. Lichen planus usually Vt hyperpigmentation but hypopigmentation may also occurQ. 