Doctors don't know the exact cause of pilomatrixomas. They develop when cells harden and form a lump under the skin. The cells are similar to hair follicle cells.
Pilomatrixomas may be more common in some families. They may also happen with conditions that are inherited (genetic syndromes).
Here are the most common symptoms of a pilomatrixoma:
The symptoms of a pilomatrixoma can be like other health conditions. Make sure your child sees his or her healthcare provider for a diagnosis.
A pilomatrixoma is usually diagnosed based on how it looks. Diagnostic tests may include: