The masses are also known as subfascial fat herniation or episacroiliac lipoma. "Back mice" is a term that usually refers to painful lumps of fat (lipomas), usually on the lower back. However ...

It wasn't painful, but its prominence became a part ... Dr. Craythorne quickly identified the lump as a lipoma. "Lipo means fat, and oma refers to a benign tumor," she explained.

An insect bite: This is a possibility if your cat is not on flea control medications, but it is unlikely based on the photo ...