... vessels, sweat glands, sweat ducts, hair follicles and sebaceous glands, dermal nerve and nerve endings, and the connective tissue of the dermis. Seventy-four patients were studied and researchers ... cases, and the remaining majority involve overlapping areas of two or three dermatomes. Type IV (V1, V2, and V3) is subdivided into 4a, involving V1 and V2, 4b, involving V2 and V3, and 4c, ... any age, and it progresses continuously with periods of remission and exacerbation. On the other hand, Type B vitiligo has an early age of onset, and spreads rapidly for a short time and then...