Becker's Nevus
That is irregular pigmentation (melanosis or hyperpigmentation) on the torso or upper arm (though other areas of the body can be affected), and gradually enlarges irregularly, becoming thickened and often hairy (hypertrichosis).It is hamrtoma in nature (benign tumor of different cell lines)
Here is a Becker's nevus on the shoulder region showing hypertricosis (hairy lesion)
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