part of part of has part has part characteristic of inheres in has modifier Cutaneous cyst Epidermoid cyst 2010-06-18T02:08:02Z SNOMEDCT_US:419603000 Sebaceous cyst Epidermoid cysts SNOMEDCT_US:418630001 A cyst is a cavity containing liquid, semisolid, or solid material. An epidermoid cyst is a benign cyst that develops out of ectodermal tissue and consists of a thin layer of squamous epithelium. An epidermal cyst may or may not be painful or release pus, and are usually noticed as a bump on the skin. Epidermal cysts and trichilemmal cysts are clinically indistinguishable. The wall of the epidermal cyst conserves the epidermal layers, but the wall of the trichilemmal cysts, which arise from the external root sheath, shows palisading of unlayered epithelial cells. Homogeneous horny material that is further degraded to fat and cholesterol forms within both types of cysts. SNOMEDCT_US:417992006 Nontender, round and firm, but slightly compressible, intradermal or subcutaneous cyst measuring 0.5-5 cm in diameter. Epidermal cysts are intradermal or subcutaneous tumors, grow slowly and occur on the face, neck, back and scrotum. They usually appear at or around puberty, and as a rule an affected individual has one solitary or a few cysts. A central, dark comedone opening (punctum) may be present. HP:0200040 Epidermal inclusion cyst Epidermal cyst Keratin cyst SNOMEDCT_US:419893006 SNOMEDCT_US:399999000 SNOMEDCT_US:418323001 Central punctum opening in cyst UMLS:C0014511 SNOMEDCT_US:419670003 Infundibular cyst cyst abnormal increased amount skin of body