My 2 year old son has been sick the last few days. Runny nose, bad cough, not eating or drinking until today and he had a high fever up until today. The Dr. said he had an ear infection, and he started amoxycillin last night, had another dose this morning and one tonight. I just noticed this rash right now on his back and tummy a little on his neck. It is not raised and has no bumps. Does anybody have an idea as to what it could be?