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What color is pus from a cyst?

Author

Mia Kelly

Published Jan 18, 2026

It's yellow or white, often with a small dark plug through which you might be able to squeeze out pus. Cysts can range in size from smaller than a pea to a few centimetres across. They grow slowly. Skin cysts do not usually hurt, but can become tender, sore and red if they become infected.

What does cyst pus look like?

It looks like a skin-colored, tan, or yellowish bump filled with thick material. It may become swollen, red, or painful if it's inflamed or infected.

Should you squeeze pus out of a cyst?

Never squeeze a cyst

Plus, you can send bacteria and sebum deep below the hair follicles, causing the materials to spread and make even more cysts. Picking at your skin also increases the risk of scarring.

Do cysts have yellow discharge?

A skin cyst is usually rounded and dome-shaped, with a yellowish or whitish appearance. In many cases it has a dark-coloured spot on the top which breaks down spontaneously or on squeezing, to discharge some pus. The size may vary, some cysts being tiny and others as big as a few centimeters across.

What colors can pus be?

Your body often produces it when it's fighting off an infection, especially infections caused by bacteria. Depending on the location and type of infection, pus can be many colors, including white, yellow, green, and brown. While it sometimes has a foul smell, it can also be odorless.

24 related questions found

What color is serous drainage?

Serous drainage

It is often thin and watery and will usually have a clear to yellowish or brownish appearance. Small amounts of serous drainage are normal during the first stages of healing.

What does the color of pus indicate?

Pus is sometimes green because of the presence of myeloperoxidase, an intensely green antibacterial protein produced by some types of white blood cells. Green, foul-smelling pus is found in certain infections of Pseudomonas aeruginosa. The greenish color is a result of the bacterial pigment pyocyanin that it produces.

What to do with a cyst that pops?

When a sebaceous cyst ruptures under the skin, it's not usually infected. In most cases, it needs to be drained by a doctor who can lance the cyst. Some physicians prescribe antibiotics to settle the red, painful area of inflammation.

What is the stuff inside a cyst?

These cells form the wall of the cyst and secrete a soft, yellowish substance called keratin, which fills the cyst. Sebaceous cysts form inside glands that secrete an oily substance called sebum. When normal gland secretions become trapped, they can develop into a pouch filled with a thick, cheese-like substance.

How long will a cyst drain?

The wound may drain for the first 2 days. Cover the opening with a clean dry bandage. If the dressing becomes soaked with blood or pus, change it. If a gauze packing was placed inside the opening of the cyst, it will need to be removed.

Do cysts smell?

The area around the cyst may smell bad. If the cyst breaks open, the material inside it often smells bad too. The cyst is usually firm and you can usually move it slightly if you try.

How do you tell the difference between a cyst and a boil?

Boils and cysts can both look like bumps on your skin. The main difference between a cyst and a boil is that a boil is a bacterial or fungal infection. Most cysts are slow-growing and benign (noncancerous), and they aren't contagious. Boils, on the other hand, can spread bacteria or fungi on contact.

Do cysts hurt to touch?

Cysts can feel tender to the touch, and a person may be able to move one easily. Tumors can also grow almost anywhere in the body. They tend to grow quickly and are usually firm to the touch.

Can a cyst ooze?

Normally, these cells move up to the surface of the skin as they start to die so they can be shed. But the cells sometimes move deeper into the skin and multiply, forming a sac. They secrete keratin into the middle of the sac, which forms a thick, yellow paste. This can ooze out of the cyst if it's burst.

Are cysts hard or soft?

A cyst can develop due to a clogged oil gland or hair follicle. Cysts feel like soft blisters when they are close to the skin's surface, but they can feel like hard lumps when they develop deeper beneath the skin. A hard cyst near to the surface of the skin usually contains trapped dead skin cells or proteins.

Do cysts bleed when they pop?

Ruptured cysts that cause mild symptoms can often be managed with pain medicines. The cyst may be looked at with an imaging test such as an ultrasound. In some cases, a ruptured cyst can cause more severe symptoms. These can include severe pain in the lower belly and bleeding.

What can happen if a cyst is left untreated?

Some cysts are cancerous and early treatment is vital. If left untreated, benign cysts can cause serious complications including: Infection – the cyst fills with bacteria and pus, and becomes an abscess. If the abscess bursts inside the body, there is a risk of blood poisoning (septicaemia).

How do you know if a cyst has ruptured?

Symptoms you may experience if you have a ruptured ovarian cyst include: Sudden, sharp pain in the lower belly or back. Vaginal spotting or bleeding. Abdominal bloating.

How do you dry out a cyst?

Hot compress

Simple heat is the most recommended and effective home measure for draining or shrinking cysts. Here's how it works: Heat may reduce the thickness of liquid in the cyst. In the case of liquid-filled epidermoid cysts, this may help fluid drain quicker into the lymphatic system.

Can I drain a cyst myself?

It might be tempting, but don't try to pop or drain the cyst yourself. That can cause infection, and the cyst will probably come back. Keep it clean by washing with warm soap and water. Try putting a bathwater-warm washcloth on it for 20 to 30 minutes, three to four times a day, to help soothe it and speed healing.

Is my cyst infected?

If a cyst has become infected, it may look red due to inflammation. Infected cysts can also have a whitish appearance due to the presence of pus. The pus may smell unpleasant. A person should see a doctor if they suspect any infections.

What does pus look like?

Pus is typically an opaque white-yellow color, but it can also be tinted brown or even green. 1 It's usually odorless, though it may sometimes smell foul. Pus is made up of a buildup of: Degenerating white blood cells.

Does pus mean infection or healing?

Pus is a sign that a wound is infected but it is also a sign that your body is trying to fight the infection and heal the injury. Once an infection has started, your immune system begins trying to fight it off. It sends white blood cells to the area to destroy the bacteria.

Does yellow pus mean infection?

Purulent drainage is a sign of infection. It's a white, yellow, or brown fluid and might be slightly thick in texture. It's made up of white blood cells trying to fight the infection, plus the residue from any bacteria pushed out of the wound. There may be an unpleasant smell to the fluid, as well.