Cyst

Cyst — a large, soft, fluid- or pus-filled lesion that forms deep beneath the skin's surface, often appearing as a painful, swollen lump. Cystic lesions are among the most severe forms of acne and, like nodules, are strongly associated with scarring.

Key points

• Cysts are typically softer than nodules because they contain fluid or pus rather than solid tissue.
• They form deep within the skin and can be painful and slow to heal.
• Cystic acne has a high likelihood of leaving scars or lasting marks.
• These lesions generally do not respond well to over-the-counter treatments.
• Attempting to pop or drain a cyst at home can worsen inflammation and scarring.

Frequently asked

What is the difference between a cyst and a nodule?

Both form deep in the skin, but a cyst is generally softer and filled with pus or fluid, while a nodule is firmer and more solid.

Why shouldn't I pop a cyst?

Cysts sit deep in the skin, and squeezing them can spread inflammation and raise the risk of scarring, so cystic acne is best managed by a dermatologist.

Related topics

• What Is a Humectant?
• What Is the Skin Barrier?

This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.