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Erroneously called
sebaceous cyst, when the dermoid occurs on the scalp, it is called a "wen."
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- Slowly growing cyst that may be a
remnant of fetal tissue. The cells lining the inner wall of
the cyst secretes a white keratin, which is a skin byproduct.
If the cyst is subject to injury, it becomes inflamed and tender.
- The dermoid does not produce the oily material known as sebum, so the term, "sebaceous cyst" is erroneous.
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- An enlarging nodule on the back of the neck or scalp
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- Theories are that injury or hormonal changes produce the cyst.
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- The location, the large size, and the keratin material within the cyst make the diagnosis.
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- Small dermoid cysts might be observed by watchful waiting.
- Large dermoid cysts can be removed with a scalpel, using sterile technique. Two techniques might be used: removal of the whole cyst, or incising the cyst and removing the contents.
- Inflamed cysts may need special treatment.
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- Incomplete removal sometimes leads to a residual inflamed or draining area in the skin.
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- Inclusion cysts would be the identical
type of cyst, but is formed by the force of injury's
driving some epithelium beneath the skin surface, where it forms a knot or nodule, and begins secreting keratin.
- Enlarged lymph nodes
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