My son has had little red bumps on his body since sunday which im guessing was some sort of allergic…

My son has had little red bumps on his body since sunday which im guessing was some sort of allergic reaction. I was hoping they would come off but i feel like he's just getting more. He's not complaining or anything the bumps are just there. Should i take him in to his doctor (i feel like they wont do anything) or what should i do?