I have a yellow patch of skin under my breast. what could be the problem?

Skin Lesions: Almost all would be benign conditions but as with any skin lesion we need to look at them, feel them, ask you a bunch of questions, perform an exam to see if we find anything else, use magnifying glass to look at the lesion, maybe take a scraping to look at under microscope or perhaps even a biopsy of the lesion. Can post picture which may help, but bottom line need to be seen for doctor to help.