See your physician: Dark areas under the breast is common, especially with large breasts. Could be sign of more serious problem. Possible causes -intertrigo (a fungal rash) and acanthosis nigricans. Intertrigo treated by keeping clean and dry, possibly needs topical creams and powders prescribed by your doctor. Acanthosis nigricans is often seen as dark, velvety skin patches - may be a sign of diabetes or pcos.
Answered 6/17/2018
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