Hello,
Apply cool compresses on the area and take bath with cool(not very cold) water. Do not scrub your skin or shave your skin and use a soft towel and gently pat your skin dry.Also use a sunburn Over-The-Counter remedy containing aloe vera and a light moisturizer or a dusting powder to relieve chafing.You can apply silver sulfadiazine (1% cream) on the skin except face and see if it helps.If the symptoms still persist then you should consult a dermatologist and discuss the option of dermabrasion or laser resurfacing.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.