Epidermal Inclusion Cyst

Firm dermal papule or nodule

Overlying black comedone or "punctum"

Expressible foul-smelling cheesy material

May become red and drain, mimicking an abscess

Benign growths of the upper portion of the hair follicle

Common in Gardner syndrome and may be the first sign of the condition

Favor the face and trunk

May complicate nodulocystic acne vulgaris

Individual lesions range in size from 0.3 cm to several centimeters

Cultures of the expressed material will be sterile

Not required if asymptomatic

Inflamed lesions may be treated with incision and drainage or intralesional triamcinolone acetonide 5–10 mg/mL

For large or symptomatic cysts, surgical excision is curative