Eczema or something else?

My daughter would get bumps if she was really hot but also noticed when she’s allergic or sensitive to something bumps come but usually go away after a few days

Heat rash maybe

Are they only on upper back/neck? It looks like it could be KP (keratosis pilaris), but that is usually only on back of arms, thighs/buttocks, cheeks, and some times torso

Just upper back and neck and little spot on his chest.
I’ll look into KP and mention it to my doctor

That is not KP my boyfriend has that, it’s most likely a heat rash. Another mom I know just keeps it cold in her house and doesn’t go out if it hot.

KP is slightly different in adults vs in babies, and visually different between adults (sometimes red, sometimes white-ish, and sometime skin toned). I think it’s still worth asking the dr about.