Occurs for congenital cause,but the most commonly aquired.The aquired type is almost present in all persons,usually as multiple lesions,starting during childhood and stop growing at puberty.They may progressively disappear,but some persist.
The lesions start as small (1-2 mm) brown to black macules that enlarge gradually (rarely excced 6mm).As they enlarge they become depigmented and appear as pink papules.By congenital cause the mole will appear blue.
If you notice any of this signs do a medical examination.
Malignant transformation is very rare.
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