Rash on breast

I have a rash on the inside area of one of my breasts. It’s red and itches. I thought it could be ringworm but there is rash all around it. Does anyone know…

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Does anybody know what these are? They hurt when touched and I didn't even realise I had them until earlier today. Is this serious? : r/bigboobproblems

Allergy rash on the breast stock photo. Image of itch - 106009518