What is a steatoma commonly known as?

A steatoma is commonly referred to as a sebaceous cyst, which is filled with sebum. Sebum is an oily substance produced by sebaceous glands in the skin, and when these glands become blocked or damaged, a steatoma can develop. This type of cyst typically appears as a small, round lump under the skin and is often painless. It's important to understand that steatomas are benign (non-cancerous) growths, which is why knowing their composition and formation is crucial in distinguishing them from other skin conditions or lesions.

The other choices, while related to skin and growths, do not accurately describe a steatoma. A cyst filled with blood specifically denotes a hematoma, which is different from the characteristics of a steatoma. A type of tumor encompasses a broader category of growths, of which a steatoma is specifically a cyst rather than a tumor in the traditional sense. Lastly, a skin rash indicates an inflammation or irritation of the skin rather than a cystic structure filled with sebum. Understanding these distinctions reinforces the definition of a steatoma and its clinical significance.