<\/span><\/h2>\nA cyst is a benign<\/span>, round, dome-shaped encapsulated<\/span> injury<\/span> containing fluid or semi-fluid material. It can be firm or fluctuating<\/span> and you often gave the overlying skin. There are several types of cysts. The most common are described here.<\/p>\n<\/span>What is a pseudocyst<\/span>?<\/span><\/h2>\nCysts that are not surrounded by a capsule are better known as pseudocysts<\/span>. These commonly arise in acne. <\/p>\n\n
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<\/span>Who has cysts?<\/span><\/h2>\nCysts are very common and affect at least 20% in adults. They can be present at birth or appear later in life. They arise in all races. Most types of cysts are more common in men than women.<\/p>\n
<\/span>What Causes Cysts?<\/span><\/h2>\nThe cause of many cysts is unknown.<\/p>\n
\n- Epidermoid cysts are due to proliferation<\/span> of epidermal<\/span> cells within dermis<\/span>. Its origin is the follicular<\/span> infundibulum<\/span>. Multiple epidermoid cysts may indicate Gardner syndrome<\/span>. The common term sebaceous<\/span> cyst, it's a misnomer.<\/li>\n
- An epidermal inclusion cyst is a response to injury. The skin folds to form a sac that is lined by healthy epidermal cells that continue to multiply, mature, and form curb<\/span>. <\/li>\n
- The origin of a tricilemmal cyst is hair<\/span> root sheath Heredity is autosomal<\/span> dominant (the affected gene<\/span> is within the short arm of chromosome<\/span> 3) or sporadic.<\/li>\n
- The origin of steatocystoma is the sebaceous duct within the hair. follicle<\/span>. Multiple steatocystoma is sometimes an inherited autosomal dominant disorder due to mutations<\/span> located<\/span> to the keratin 17 (K17) gene, when it may be associated with pachyonychia<\/span> congenital Most often, steatocysts are sporadic, when these mutations are not present.<\/li>\n
- The origin of the eruptive. hair<\/span> The cyst is the follicular infundibulum. It can be inherited as a autosomal dominant<\/span> disorder due to mutations in the keratin gene. <\/li>\n
- A dermoid cyst is a hamartoma<\/span>, a development error.<\/li>\n
- The origin of a ganglion<\/span> cyst is degeneration of the mucosa connective tissue<\/span> of a joint. <\/li>\n
- \nOcclusion<\/span> pilosebaceous units (hair follicles<\/span>) or eccrine<\/span> sweat ducts lead to an accumulation of secretions, which can present as milia<\/span>.<\/li>\n
- Occlusion of the orifice of a mucous<\/span> gland can lead to a fluid-filled cyst in a mucous membrane<\/span> (lip, vulva<\/span>, vagina)<\/li>\n
- A milium<\/span> is a pseudocyst due to the inability to release keratin from a attached<\/span> structure. The origin of primary<\/span> milium is the infundibulum of the hairy follicle at the level of the sebaceous gland and is a miniature version of an epidermoid cyst. The source of secondary milium is a retention cyst within a hairy hair follicle, sebaceous duct, sweat duct, or epidermis<\/span>.<\/li>\n
- Pseudocysts in acne are formed by occlusion of the follicle by keratin and tallow<\/span>.<\/li>\n<\/ul>\n
<\/span>What are the clinical features of cysts?<\/span><\/h2>\n<\/span>Epidermoid cyst<\/span><\/h3>\n\n- Epidermoid cysts occur on the face, neck, trunk, or anywhere there is little hair.<\/li>\n
- Most epidermoid cysts arise in adult life.<\/li>\n
- They are more than twice as common in men as in women.<\/li>\n
- They appear as one or more flesh-colored to yellowish, adherent, firm, round. nodules<\/span> of variable size.<\/li>\n
- A central pore or punctum may be present.<\/li>\n
- The keratinous content is soft, cheesy, and smelly.<\/li>\n
- Scrotal and labial cysts are frequently multiple and can calcify.<\/li>\n<\/ul>\n
An epidermoid cyst is also called a follicular infundibular<\/span> cyst, epidermal cyst, keratin cyst.<\/p>\n\n<\/span>Epidermoid cyst<\/span><\/h5>\n<\/section>\n\n\n
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Gardner syndrome<\/p>\n<\/p><\/div>\n<\/section>\n
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See more images of epidermoid cysts.<\/p>\n
Tricilemmal cyst<\/p>\n
\n- The 90% of tricilemmal cysts occurs on the scalp; otherwise, face, neck, trunk and extremities.<\/li>\n
- Most tricilemmal cysts arise in middle age.<\/li>\n
- In 70% of cases, the tricilemmal cysts are multiple.<\/li>\n
- They appear as firm, adherent, round or oval nodules.<\/li>\n
- There is no punctum.<\/li>\n
- The keratinous content is firm, white, and easily enucleated.<\/li>\n<\/ul>\n
A tricilemic cyst is also called a pillar cyst.<\/p>\n\n<\/span>Tricilemmal cyst<\/span><\/h5>\n<\/section>\n\n\n
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Pillar cyst<\/p>\n
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Pillar cysts<\/p>\n
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Pillar cyst<\/p>\n<\/p><\/div>\n<\/section>\n
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See more images of epidermoid cysts.<\/p>\n
<\/span>Steatocystoma<\/span><\/h3>\n\n- A solitary steatocystoma is known as a simple steatocystoma.<\/li>\n
- Most often, there are multiple lesions (multiple steatocystoma) on the chest, upper arms, armpits<\/span>, neck and scrotum or vulva.<\/li>\n
- Cysts appear in the late teens and early 20s due to the effect of androgens<\/span> and persist for a lifetime.<\/li>\n
- They are of free movement, soft pulp to yellow color. papules<\/span> 3\u201330 mm in diameter.<\/li>\n
- There is no central punctum.<\/li>\n
- The content of the cyst is predominantly sebum.<\/li>\n<\/ul>\n\n
<\/span>Multiplex steatocystoma<\/span><\/h5>\n<\/section>\n\n\n
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Multiplex steatocystoma<\/p>\n
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Multiplex steatocystoma<\/p>\n<\/p><\/div>\n<\/section>\n
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<\/span>Eruptive hairy cysts<\/span><\/h3>\n\n- Eruptive downy hair cysts are present in childhood if family<\/span>, and then if it is sporadic.<\/li>\n
- They are seen in association with multiple steatocystoma.<\/li>\n
- Multiple 2\u20133 mm papules develop over the sternum.<\/li>\n
- Cysts contain hairs.<\/li>\n<\/ul>\n