Epidermoid cyst

An epidermoid cyst is a common, benign skin lesion, often referred to simply as a 'sebaceous cyst,' although it does not typically originate from sebaceous glands.

These cysts are slow-growing, round, and firm, encapsulated structures found beneath the skin.

They result from an accumulation of keratin, a protein that provides structural strength to skin, hair, and nails, within a thin, cystic wall lined by stratified squamous epithelium.

Epidermoid cysts can appear anywhere on the body, but are frequently located on the face, neck, and back, which categorizes them primarily within the 'Head' region for this description.

The cyst often presents as a small, painless bump beneath the skin, although it can become inflamed or infected, leading to redness, tenderness, and sometimes a cheesy, foul-smelling discharge if ruptured.

While they are generally harmless, their aesthetic appearance or potential for infection might warrant removal, usually via surgical excision.

In terms of detection, while physical examination is often sufficient for diagnosis, imaging techniques can be employed if the cyst is atypical in appearance or located in a sensitive area, requiring further exploration to rule out other conditions.

A 'Whole Body' scan, such as an MRI or CT scan, can reliably identify these cysts, especially if there's a need to assess deeper tissues or exclude other differential diagnoses, although such extensive scanning is rarely necessary for typical presentations.

The prognosis for epidermoid cysts is excellent, with most patients experiencing complete resolution following treatment.