My 2.5 year old is still in nappies and every now and then gets a tiny little cluster/patch of three or four pimples on one of his buttocks. I put metanium on it which seems to dry in out and make it look scabby/flaky but after a few days it goes. He has a lot of problems with recurring thrush/nappy rashes but this comes regardless of the rest of his skins condition. Any ideas what this could be? X