Hello,
It can be due to dryness of skin or dermatitis skin. You should use an antibacterial soap or mild soap like dove. Avoid deodorant / cosmetics. You can also use calamine lotion or cream with zinc oxide paste applied directly to wet skin after bathing. Take some antihistaminic like Benadryl or Claritin.
If the rash persists then it will be best to get it evaluated from a dermatologist.
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.
Hi Sasha! I'm not personally familiar with these symptoms but I hope someone who can help will post soon!