Thanks for the query.
I understand your concern.
Shingles or herpes zoster is a viral infection caused by varicella zoster virus.
According to your history, positive points towards shingles diagnosis are rash over chest region, itchy and painful rash.
But rash under breast can occur due the warmth and moisture there and can be seen in other conditions like yeast infection, contact dermatitis etc.
By clinical examination and investigations like fluorescent antibody staining and PCR etc, the possible cause of the problem can be identified and treated.
So, please do consult your doctor and get evaluated.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.