What Is a Cyst?
2. Pilar Cyst
A pilar cyst, or trichilemmal cyst, is a cyst that forms from a hair follicle. It is most generally seen on the scalp as it occurs in areas with a high concentration of hair follicles. Therefore, about 90% of pilar cysts are found on the scalp with 30% as a single cyst and the other 70% as multiple cysts.
These cysts are generally mobile, smooth, and filled with a protein component known as keratin. Keratin can be found in hair, skin, and nails. The risk of pilar cysts are higher in those with a positive family history. The cyst may or may not be tender or inflamed depending on whether it has ruptured. The treatment of a pilar cyst generally involves surgery that can be performed under a local anesthetic or a punch biopsy.
Advertisement