Pilar Cyst Hair Growth: What to Know

A pilar cyst, also called a trichilemmal cyst, is a rounded sac associated with a hair follicle. It commonly feels smooth and firm beneath the skin of the scalp. Hair can emerge normally through or around the area, so visible hair does not confirm or exclude the diagnosis. A scalp lump can have other causes, and an examination is the way to identify its nature.

The cyst itself does not make nearby hair grow faster. Pressure, rubbing from a brush, or catching the lump during styling may make the scalp feel tender even when the hair looks unchanged.

Avoid squeezing, puncturing, or repeatedly pressing the lump. Use gentle shampooing and a soft brush, and take care not to scrape it with comb teeth or hair accessories. If it is small and not troublesome, a clinician may discuss observation. If it catches, becomes bothersome, or returns after drainage, a dermatologist can explain whether complete cyst removal is suitable.

Take a clear photo if the size or surface changes, and note tenderness, discharge, or hair loss in the area. You can read about [Skin Lumps](/symptoms/skin-lumps/) and [Cyst Removal](/treatments/surgical-dermatology/cyst-removal/) for general context.

Arrange a prompt clinical assessment if the lump becomes rapidly larger, hot, very painful, increasingly red, or begins draining. Seek urgent help for spreading redness, fever, marked swelling, or feeling unwell. New patchy hair loss over a lump, bleeding, or a sore that does not settle also deserves examination.

Ask whether the lump has features of a pilar cyst, whether the follicles and skin appear healthy, and whether monitoring or removal makes more sense. Ask what changes should prompt a return visit and how to protect the area while brushing or styling.