Rash baby might have a rash somewhere on his or her body. I just figured this out for myself:
My son was crying terribly so I inspected his hiney and I saw nothing at all, until I looked a little deeper and it was not a full grown rash, but it was growing in and it was just red below his testicles, really small. I put some a and d ointment in, closed the diaper and he's good as new.
Sometimes rashes can't be seen, it's just a red area. So if you experience a crying baby at diaper change just put some ointment down there everywhere just to be safe, because it's very painful for babies and they can not talk to tell us what's wrong.