Epidermoid cyst

An epidermoid cyst is a benign cyst, developed out of ectodermal tissue. Histologically, it is made of a thin layer of squamous epithelium.

It is very common for women on the major or minor labia.


The more general term for an Epidermal Inclusion Cyst (which strictly means implantation of epidermal elements into the dermis), Epidermoid cyst includes cysts originating from the infundibular portion of the hair follicle.

The majority of Epidermal Inclusion Cysts do in fact originate from the infundibular portion of the hair follicle thus explaining the interchangeable, yet technically incorrect, use of these two terms.


These cysts are caused by a bacterium and form into a pimple-like shape. They are also seen in Gardner's syndrome on the head and neck.


For some individuals, it doesn't even irritate. For others, it can hurt and when touched, it can release pus.

In contrast to pilar cysts, epidermoid cysts usually present on parts of the body with relatively little hair.

Although they are not malignant, it is possible for malignant tumors to arise from them.


MRT isointens, FLAIR hyperintens.


Cysts can be removed by excision.

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