Noah has a rash on his belly, back, shoulders and above his privates. Recently he started wearing…

Noah has a rash on his belly, back, shoulders and above his privates. Recently he started wearing parents choice diapers and idk what brand of pull ups. I’ve also been washing his clothes with whatever detergent we get and I’ve been doing that for a long long time now....he has no fever and I don’t think it’s bothering him but I’m a little worried it won’t go away 😔 idk what I should do other than watch him .