My son woke up with a few small bites on his back, which weren't a problem. But itchy feet . In the next 4 days his hands & feet are covered in a rash, which is slowly spread over most of his body. It is pink and raised fine tiny lumps. Not itchy but feels tight &slighty swollen,, inside his mouth also feels odd. He saw. A doctor Two days ago and has taken antihistamine , but it hasn't changed. He felt a food allergy, last night I was thinking it could be related to those initial small bite on back?