What is idiopathic guttate hypomelanosis ?
It consists of discrete porcelain-white, patches of about 5 mm diameter, in sun-exposed areas of the skin, especially on the forearms and shins. The patches do not increase much in size. The hairs over the lesion are normal in colour.
Usually no treatment is necessary.
How does one differentiate idiopathic guttate hypomelanosis from vitiligo?
Vitiligo is usually symmetrical. The lesions in vitiligo are chalky-white and tend to have a scalloped edge. The white patches of vitiligo tend to enlarge. The hair over the lesions are also white.
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