Hi, my 3 1/3 years old son had influenza A last month and took the tamiflu, right after that he had an year infection and took amoxicillin, the last dose was about 3 days ago. On the last couple of days, he developed a rash on the neck, back, chest and belly, it s a bit ichty. the area gets red with white center (round or straight lines). Is that a reaction to the antibiotic or something else?