My Maltese has a 1/2 dollar size black spot on her back, I shaved it to get a closer look and it almost looks like blackheads the vet said it was acne never knew they could get this. He gave her anti-biotics and said put clearsil on it I have been putting peroxide on it it looks alittle better but not much. Any other suggestions the clearsil did nothing but dry out her skin she would not take the anti-biotics I tried everyting she will not take medicine.