A strange bump on a man’s elbow was thought to be a cyst, until it was popped and dissected with a pair of tweezers. Dr. Sandra Lee, popularly known as “Dr. Pimple Popper,” cut into the swelling on the patient’s elbow with a scalpel in her California clinic Skin Physicians & Surgeons in Upland, and then used a long pair of tweezers to reach its growth. Upon teasing the dark growth out of his arm, she immediately noticed it was a blood clot that needed to be squeezed out.

“It looks like it might be hard, it's like a rock under there,” she says, in the video. Intrigued by the unusual growth, as she removes it, she admits, “what is that? It's like a little cyst that has a clot in it, I don't know yet. This is very curious.”

She dissects the bump, and realizes its “rock hard” center is the result of the condition pilomatricoma. This is an unusual benign (non-cancerous growth) skin tumor, which forms from the cells at the base of hair follicles. Hair follicles are specialized structures in the skin where hair growth occurs. These tumors most often occur on the head or neck, although they can also be found on the arms, torso, or legs, according to the Genetics Home Reference.

“You had a pomegranate seed in your arm, that's our diagnosis,” Lee jokingly describes to her patient, who is a driver for her dermatopathology slide service. “Do you have a pomegranate tree?”

She explained that a blood clot had formed around the pilomatricoma, which is what led the elbow to swell.

Last year, in a similar case, a man developed a large blood clot on his shin while skateboarding after he crashed onto the ledge. “My shin was the size of a baseball,” wrote user JL Films in the YouTube description. After two weeks, the man went to the doctor to have it drained.

If you have a blood clot that is causing swelling in a specific area, visit a medical professional to have it removed.