The primary objective is to determine the efficacy of STS foam injection on EIC with an endpoint of clinical resolution and cyst wall destruction on histology.~Enrolled subjects will undergo aspiration of cyst contents through an 18g needle immediately followed by injection of 1.5% STS foam (until the cyst is full and foam is flowing out of the injection site) followed by surgical excision 60 days later. The foam will be created by diluting 3% STS with an equal volume of normal saline then mixing with air in a 1:4 ratio using a female-to-female coupler.
The objective of this study is to determine the efficacy, safety, tolerability, and patient satisfaction associated with the treatment of epidermoid cysts with injected 1.5% sodium tetradecyl sulfate (STS) foam.