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 New to All Access
-
A Moment of Marvelous Milia
A milium (single for milia) is a small superficial cyst formed in the top layer of the skin called the epidermis. Milia appear as tiny, pearly-white bumps just under the surface of the skin and contain keratin (skin protein). They are often seen on the face, in particular on the delicate skin aro...
-
A White Elephant Lipoma
This patient had quite a large lipoma on her back! It was quite the unexpected gift.
What's the weirdest White Elephant gift you've ever gotten?Lipomas are slow-growing, benign (non-cancerous) growths of fat cells. These cells are contained in a thin capsule that creates the appearance of a “b...
-
A Gumdrop Lipoma
Lipomas are slow-growing, benign (non-cancerous) growths of fat cells. These cells are contained in a thin capsule that creates the appearance of a “bump” right under the skin. Lipomas are typically not tender, move around easily, and don’t require treatment. However, some lipomas may sit in plac...
4 Comments