A veteran breakdancer who had been actively head-spinning for about 19 years as part of his routines developed a protuberant and tender bulge on top of his head.

Head-spinning as part of breakdancing training can cause hairless bumps on practitioners’ heads, according to a medical case study recently published in the BMJ Case Reports journal.

Also known as “headspin holes” in the breakdance circles, these bulges are sometimes associated with a circle of hair loss and can become painful.

In the recently documented case, the patient, a man in his 30s who had been incorporating the dangerous dance move for nearly two decades, reported spinning on his head for about two to seven minutes about five times a week.

While the seemingly innocuous bump appeared sometime back and grew in mass and sensitivity in the last five years, it didn’t hinder his stunts, according to the report.

Following examinations of the bulge and a structural scan of the patient’s cranium, doctors determined that a soft mass was sandwiched between the skin and the skull.

Surgery was decided to remove the mass and also to shave the man’s scalp back to the level of the tissue around it.

Referred to as the “breakdancer overuse syndrome,” this condition associated with breakdancing has rarely been scientifically documented. However, it is known among breakdancers.