Mysterious brown marks have appeared under my armpits and breasts. I'm an otherwise healthy woman but I'm worried. DR SCURR reveals how to tell a common bacterial infection from something MUCH more sinister

Brown marks have appeared under my armpits and breasts, and I can't seem to get rid of them. I'm in my 30s, healthy and it's getting me down. I heard it could be a sign of prediabetes.

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