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Relative incidence of cutaneous cysts, where epidermoid cysts constitute a plurality (blue area). An epidermoid cyst or epidermal inclusion cyst [1] is a benign cyst usually found on the skin. The cyst develops out of ectodermal tissue. Histologically, it is made of a thin layer of squamous epithelium.
A sebaceous cyst is a term commonly used to refer to either: [1] Epidermoid cysts (also termed epidermal cysts, infundibular cyst) Pilar cysts (also termed trichelemmal cysts, isthmus-catagen cysts) Both of the above types of cysts contain keratin, not sebum, and neither originates from sebaceous glands.
By 2010, studies supported that epidermoid cysts are believed to be caused by dystrophic calcification. This process involves subclinical inflammation, rupture, calcification, and cyst wall obliteration. [6]
Relative incidence of cutaneous cysts. Milia is labeled at bottom right. A milium (pl.: milia), also called a milk spot or an oil seed, [1] is a clog of the eccrine sweat gland. It is a keratin-filled cyst that may appear just under the epidermis or on the roof of the mouth.
Vocal fold cysts (also known as vocal cord cysts) are benign masses of the membranous vocal folds. [1] These cysts are enclosed, sac-like structures that are typically of a yellow or white colour. [2] They occur unilaterally on the midpoint of the medial edge of the vocal folds. [1] They can also form on the upper/superior, surface of the vocal ...
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.
The full chapter can be found on pages 379 to 393 of Volume 1, which contains all (sub)categories of the ICD-9. Volume 2 is an alphabetical index of Volume 1. Both volumes can be downloaded for free from the website of the World Health Organization.
The cysts can be removed via excision, though conventional cyst excision techniques have proven impractical, and a specialized regimen is required. [5] Cryotherapy and electrodessication may also be tried, but since it is a genetic disorder all the modalities have very little effect. Individual cysts can be removed surgically.