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Relative incidence of cutaneous cysts: Trichilemmal cyst is labeled near top. A trichilemmal cyst (or pilar cyst ) is a common cyst that forms from a hair follicle , most often on the scalp , and is smooth, mobile, and filled with keratin , a protein component found in hair , nails , skin , and horns .
Proliferating trichilemmal cysts (also known as a pilar tumor, proliferating follicular cystic neoplasm, proliferating pilar tumor, and proliferating trichilemmal tumor) [1] is a cutaneous condition, characterized by proliferations of squamous cells forming scroll-like structures. [1] [2]: 678
About 90% of pilar cysts occur on the scalp, with the remaining sometimes occurring on the face, trunk, and extremities. [7]: 1477 Pilar cysts are significantly more common in females, and a tendency to develop these cysts is often inherited in an autosomal dominant pattern. [7]: 1477 In most cases, multiple pilar cysts appear at once.
Keratosis pilaris (KP; also follicular keratosis, lichen pilaris, or colloquially chicken skin. [1]) is a common, autosomal-dominant, genetic condition of the skin's hair follicles characterized by the appearance of possibly itchy, small, gooseflesh-like bumps, with varying degrees of reddening or inflammation. [2]
Pilomatricoma is a benign skin tumor derived from the hair matrix. [2] [3] These neoplasms are relatively uncommon and typically occur on the scalp, face, and upper extremities.
Proliferating epidermoid cyst (proliferating epithelial cyst) Proliferating trichilemmal cyst (pilar tumor, proliferating follicular cystic neoplasm, proliferating pilar tumor, proliferating trichilemmal tumor) Pseudocyst of the auricle (auricular endochondrial pseudocyst, cystic chondromalacia, endochondral pseudocyst, intracartilaginous cyst)
The epidermoid cyst may have no symptoms, or it may be painful when touched. It can release macerated keratin. In contrast to pilar cysts, epidermoid cysts are usually present on parts of the body with relatively little hair. [2] Some vaginal cysts are epidermoid cysts. [3]
Cutaneous ciliated cysts are a cutaneous condition characterized by solitary cysts located on the legs of females. [ 1 ] : 682 They are usually asymptomatic. The exact causes is unknown but they are believed to be made of ectopic Mullerian residue or ciliated eccrine gland metaplasia.