My son, 13 yrs old, got this allergy in his right arm pit, after scrubbing it with a scruber a little very hard while taking a bath a week ago. There was a slight rash due to the pressure. The other left hand arm pit is good. Now, the area is itching and the skin peeling off is spreading. Kindly suggest a simple cream that would help to arrest the itching and inflammation. I have attached the picture.