Pimple On Dog's Back. When those pimples or bumps occur on body parts other than the muzzle then its most likely due to excess oil produced by the sebaceous glands. Blackheads whiteheads and pustules can also be found on the dogs belly or back and sometimes even on the tail.

This can be sterile no bacteria present or infected contains bacteria. The appearance of white pimples on dogs head is due to the presence of pus. Blackheads whiteheads and pustules can also be found on the dogs belly or back and sometimes even on the tail.
In some cases it may be necessary to drain the abscess.
A sebaceous cyst is a blocked oil gland that looks like a pimple. In some cases it may be necessary to drain the abscess. Basically a sebaceous cyst is a very large pimple that is harmless to your pet and may feel like a raised bump. Here is a button on my dog amazing he is going through puberty haha.