My son had some small flesh toned raised dry bumps on his hands and feet. I gave him a Benedryl, lotioned him up and sent him to bed. The next morning the bumps were everywhere. Went to the pediatrician they said they didn't know the cause but that it wasn't contagious and he could go to school. It has been a week and no improvement. They are scabbing up probably due to him scratching them. How long should I wait until I bring him back if there is no improvement? Any treatment suggestions?