Not sure if this is the same but my eng cream had a very dark belly (good thing—nice pigment and changed to pink) and had a case of what my vet called “puppy pimples”. She gave us an ointment that cleared it immediately. Didn’t help that it was summer and he was constantly in the baby pool so damp a lot. He totally outgrew this. It did freak me out at first one of the pimples was quite large!