My son who is 19 developed a rash on his face and started coughing two weeks ago. He is also tired and now takes an hr nap this last two days. I bought some benadryl cream and he used that for a few days and the rash is gone but the cough remains. Sometimes he can t stop coughing. Nothing coming up. No white spit or anything. Cough will stop for awhile and then start again. He uses Robitussin but that doesn t stop it.He has no other symptoms NO Congestions, No Fever, No Sore Throat or drainage, No swelling. Going to see our doctor in two days. Any Idea? Clue? THANKS!