Epidermoid and Pilar Cyst

Question 1

Define epidermoid and pilar cyst

Answer 1

Epidermoid:
Benign cyst usually found on the skin. The cyst develops out of ectodermal tissue. Histologically, it is made of a thin layer of squamous epithelium.

Pilar:
Flesh-colored bumps that grow on the skin’s surface. They usually occur on the scalp in the lining of hair follicles

Question 2

What are the causes/risk factors of epidermoid and pilar cyst?

Answer 2

Epidermoid cysts are usually caused by a buildup of keratin
• response to sin trauma
• HPV infection
• acne
• excessive exposure to sun

Pilar cysts are caused by excess keratin build up
• may be hereditary
• more common in middle aged women

Question 3

What are the signs and symptoms of epidermoid and pilar cyst?

Answer 3

Epidermoid:
• A small, round bump under the skin, usually on the face, neck or trunk
• A tiny blackhead plugging the central opening of the cyst
• A thick, yellow, smelly material that sometimes drains from the cyst
• Redness, swelling and tenderness in the area, if inflamed or infected

Pilar:
• no pus
• shouldn’t be painful
• may rupture leading to pain/irritation in the affected area