My 6 yr old broke out in a rash yesterday. He has asthmas and is getting over a cold. He takes flovent, singular and proair. The rash has some whiplike appearance. The rash is on his stomach, back, behind, shoulders, and small rash in his hair. Yesterday we gave him some benadryl and put calamine lotion on the rash. All day he was not itching and rash looked like it was going away. When it was time for bed began itching again and the rash spread to his behind. What could this be?