A Baker’s cyst is a fluid-filled lump that develops behind the knee, often linked to arthritis or cartilage tears. While some cause no discomfort, others can limit movement or even rupture.

An epidermal inclusion cyst — also known as an epidermoid cyst, infundibular cyst, keratin cyst, or inclusion cyst — is the most common type of cutaneous cyst. Patients present with a nodule that is ...