A pilar cyst, also known as a trichilemmal or isthmus-catagen cyst, is a benign (non-life-threatening) growth that, upon examination, looks identical to the more common epidermoid cyst, except that 90% of pilar cysts occur on the scalp. They tend to be more mobile and firmer than epidermoid cysts, and are derived from a different part of the hair follicle. The internal contents tend to be more "homogenous" and smooth. It is not uncommon to have multiple pilar cysts on the scalp and for the condition to run in families. Treatment is generally only for cosmetic reasons and excision with removal of the cyst and its contents is curative. The nice thing about these cysts is that they are often thicker-walled, so they can often be "popped" out whole, which not only ensures that I've removed it completely, but also leads to an extremely satisfying “pop!”
Up Next in Cystactular Cysts
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The "Got Ya!" Cyst on the Back
Grab your splash masks because this cyst came to pop out!
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A Polite Cyst on the Cheek
A nice little cyst politely hiding out on the cheek!
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Two Little Beans in the Scalp
A scalp with a couple of pilar cyst has joined the pop party!
A pilar cyst, also known as a trichilemmal or isthmus-catagen cyst, is a benign (non-life-threatening) growth that, upon examination, looks identical to the more common epidermoid cyst, except that 90% of pilar cysts occur on the sca...
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