HelloCustomer Sebaceous cysts and collections of sebaceous material within porous follicles tend to have a resilient and stubborn wall around them. The material can sometimes be extruded from the source, but it will inevitably recur due to the retention of the wall around it below the surface.
The procedure to remove sebaceous, walled collections is excisional surgery -- some will refer to it as cyst enucleation. The wall should be removed along with the contents, and it's much easier to perform when it's not infected, inflammed, or swollen. The physician that is most apt for this procedure is either a Urologist or General Surgeon. It's a brief outpatient procedure in almost all cases. In some cases where cyst excision is not possible, a marsupialisation procedure can be performed to keep the sebaceous collection and cystic structure open to drainage, followed by excision. Almost all sebaceous cysts and collections on the penis are excisable, though.
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Happy to help. Take Care. /Daniel