Does anyone know what this could be?!?! It keeps happening to my son and I don't know how. Its been 4 days it won't go…

Hives or heat rash? I would take him in especially if it's bothering him.

No its not bothering him like he isn't trying to itch it or crying and he was amoxicillin but I stopped it yesterday cause I thought it was hives from it :/

I thought they looked like bites

They look like bedbug bites check your mattress

He has a crib mattress, and how do you check your mattress for that? @raisingmatheo