An epidermal cyst may become infected. This is manifested by pain, tenderness and localized swelling. Incision and drainage of the cyst will release a foul-smelling purulent material containing necrotic...
Histologically, epidermal cysts are lined with a true squamous epithelium similar to that seen on the surface of the skin. The cyst itself is filled with laminated layers of shed keratin.
Note the round white cyst in the tympanic membrane just overlying the malleus of this right tympanic membrane. This is a rare intratympanic membrane epidermal cyst.
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![Infected Epidermal Inclusion Cyst [drained]](https://medtube.net/images/min/93a1fc620bea4c6f165c0d41cca253c5/149/112/1 "Infected Epidermal Inclusion Cyst [drained]")
![Epidermal Cyst [surgical specimen]](https://medtube.net/images/min/682d3e9584f601fc595604bcdf1a1f66/149/112/1 "Epidermal Cyst [surgical specimen]")
