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From your description also , it seems like case of idiopathic guttate hypomelanosis
Idiopathic guttate hypomelanosis (IGH) is an acquired, benign leukoderma
of unknown etiology. Idiopathic guttate hypomelanosis is most commonly a complaint of middle-aged, light-skinned women, but it is increasingly seen in both sexes and older dark-skinned people with a history of long-term sun exposure.Typically, idiopathic guttate hypomelanosis develops first on the legs of fair-skinned women in early adult life. Later, it may spread to other sun-exposed areas, such as the arms and the upper part of the back. The face is inexplicably not involved early in idiopathic guttate hypomelanosis
Idiopathic guttate hypomelanosis is a benign condition
In most cases, treatment is not required as the marks are completely harmless. Attempts to destroy the lesions may leave brown marks or larger white marks, which may look worse than the original condition. Sun protection is very important.
The following measures may improve the appearance.
Localised superficial dermabrasion
Pinch grafts of normally pigmented skin
Hope it helps
Dr Geetika Paul