A sebaceous cyst (a form of trichilemmal cyst) is a closed sac or cyst below the surface of the skin that has a lining that resembles the uppermost part (infundibulum) of a hair follicle and fills with a fatty white, semi-solid material called sebum. Sebum is produced by sebaceous glands of the epidermis.
Can you explain what a sebaceous cyst is?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: Can you explain what a sebaceous cyst is? [/INST] \n A sebaceous cyst (a form of trichilemmal cyst) is a closed sac or cyst below the surface of the skin that has a lining that resembles the uppermost part (infundibulum) of a hair follicle and fills with a fatty white, semi-solid material called sebum. Sebum is produced by sebaceous glands of the epidermis.</s>