Rash on breasts! Help please

Rare breast cancer disguised as a rash is delaying diagnosis, The Independent

Rash on breast (Pic attached)

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

Inflammatory Breast Cancer: Signs, Symptoms, Causes & Treatment

Sweating Can Lead to Heat Rash: Here's What To Do About the Prickly Problem - International Hyperhidrosis Society

Armpit Rash: Causes and Treatments

Itchy Breasts to Breast Cancer

Rash is one of the common - Breast Implant Victim Advocacy

Breast rashes: A symptom of cancer or something else

underboob rashes : r/bigboobproblems