The exact causes is unknown but they are believed to be made of ectopic Mullerian residue or ciliated eccrine gland metaplasia.
Cutaneous ciliated cysts range from 1 to 4 cm in size and are typically soft, variable, nonhyperemic, and painless masses.
The first is that they are an ectopic Müllerian residue because, after puberty, they grow with hormonal stimulus and mimic the epithelium protecting a girl's fallopian tubes.
[2] Under light microscopy, the cysts appear to be uniloculated and have ciliated cuboidal to columnar epithelium around them that lacks mucous cells.
[3] The recommended course of treatment for cutaneous ciliated cysts is surgical excision under local anesthesia.