What is a punctum in a sebaceous cyst?

A central pore or punctum may tether the cyst to the overlying epidermis and a thick cheesy material can sometimes be expressed.

Sebaceous cysts are often present as a painless skin lump. They may present with a foul-smelling discharge. If they become infectious, they are red and swelled. Cysts of the genitals can be painful during sex and results in problems with walking or wearing underwear. They can also interfere with pee.

Epidermoid and pilar cysts appear as firm, round, mobile, flesh-coloured to yellow or white subcutaneous nodules of variable size. In people with dark skin, the cysts may also be pigmented.
 

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