I can't be sure without seeing you, of course, but I think you may have acanthosis nigricans. (This literally means "dark thickening.") It's pretty
commonCommon cold and most of the time of no significance beyond appearance. I recommend that you consult a dermatologist for diagnosis and perhaps treatment with topical creams which can help smooth and lighten the
skinActinic keratosis
Aging changes in skin
Allergy skin prick or scratch test
Allergy testing
Basal cell carcinoma
Birthmarks - red
Cellulitis
Circumcision
Cutaneous skin tags
Dry skin
Fair skin cancer risks. It's slow going, but improvement is possible.
Take care.
Dr. Rockoff