Cysts

Overview

A cyst is a small sac or pocket that can form under the skin or deeper inside the body. It has a thin wall and is usually filled with fluid, air, or soft material. Think of it like a little balloon or pouch that sits in one place. Most cysts are harmless and grow slowly. Some never cause any trouble at all, while others can become sore, red, or infected. Cysts can appear almost anywhere: on the skin, in the breast, on the wrists and hands, in the ovaries, and in other organs. Many types are not cancer and do not turn into cancer. Still, any new lump deserves a check, because only a doctor can tell you what it is.

Yes, cysts are very common. Skin cysts are one of the most frequent reasons people see a doctor about a lump, and many people have a small cyst at some point in their life without ever needing treatment. Ovarian cysts are also very common in women of childbearing age, and most of these are harmless.

Cysts can affect anyone at any age, from newborns to older adults. Some types are more common in certain groups: skin cysts (epidermoid cysts) are seen most often in adults, ganglion cysts are more common in women between about 20 and 40, pilonidal cysts are more common in young men, and ovarian cysts happen in women who are still having periods. Some cysts run in families.

Symptoms

Common symptoms

• A round or oval lump that feels smooth and may move slightly when you press it
• A lump that has been there a while and grows very slowly, or not at all
• A small dark dot or pore in the middle of the lump (common in skin cysts)
• Thick, cheesy-smelling material that sometimes leaks out of a skin cyst
• Mild tenderness when the area is pressed or rubbed
• Redness, warmth, swelling, or pain if the cyst becomes infected
• No symptoms at all — many cysts are found by chance during another check

Symptoms in children

• Small lumps on the face, neck, or scalp, including some present from birth (dermoid cysts)
• Cysts on the wrist or fingers (ganglion cysts), which are usually painless
• A lump that may get bigger or change with activity
• Cysts in children are usually harmless, but a doctor should look at any new or changing lump

Symptoms in older adults

• Skin cysts are common on the face, neck, back, and ears
• Lumps that look like cysts but are new, firm, fast-growing, or fixed in place need checking, because other growths can look similar
• Sun-damaged or irritated skin may make cysts more likely to become inflamed
• Older adults may notice cysts they have had for years becoming sore or changing

Causes

Main causes

• Blocked skin glands or hair follicles, which trap oil and skin cells and form a sac
• Skin cells pushed deeper under the skin after an injury, piercing, or surgery
• Fluid leaking into a pocket around a joint or tendon, which forms a ganglion cyst
• Normal hormone changes, which can cause ovarian cysts each month
• Infection or inflammation in a small area of tissue
• Some cysts are present from birth (for example, dermoid cysts)
• Rarely, an infection from a parasite can cause cysts in organs such as the liver

Risk factors

• Skin injury, acne, or repeated rubbing and friction
• A family history of certain types of cysts
• Smoking
• Being overweight
• Sitting for long periods, which raises the risk of pilonidal cysts near the tailbone
• Hormonal changes, including the menstrual cycle and pregnancy
• Certain inherited conditions that cause many cysts, such as some kidney or skin conditions

When to see a doctor

See a doctor urgently if:

• The lump is very painful, hot, red, or swelling quickly
• You have a fever with a red, tender lump
• Pus or blood is coming from the lump
• You have a lump in your neck that affects breathing or swallowing — call your local emergency number straight away
• A lump appears suddenly and is very sore

Book a routine appointment if:

• You have any new lump that lasts more than a few weeks
• A lump is getting bigger, changing shape, or changing colour
• A cyst keeps coming back or leaks fluid
• The lump bothers you, catches on clothing, or affects how you feel about your appearance
• You are worried about a lump, even if it seems small

Diagnosis

A doctor will usually start by asking when you first noticed the lump, whether it has changed, and whether it is painful. They will look at and gently feel the lump, checking its size, shape, whether it moves, and whether the skin over it looks inflamed. In many cases that is enough to make a likely diagnosis. If there is any doubt, or if the cyst is inside the body, the doctor may arrange a scan or take a small sample.

Tests that may be done

• Physical examination of the lump and the skin around it
• Ultrasound scan, which uses sound waves to show whether a lump is filled with fluid or solid
• A small sample of fluid or cells taken with a thin needle, if the doctor wants to check the contents
• Blood tests if infection or another condition is suspected
• Other imaging, such as a CT or MRI scan, for cysts deeper inside the body
• A referral to a specialist for cysts in certain places, such as the breast or ovary

What to expect at your appointment

Most appointments for a cyst are short and simple. You may be asked to undress or lift clothing so the doctor can see the area, and you can ask for a chaperone if you would prefer one. If a scan is needed, it is usually painless and takes only a few minutes. If a sample is taken, the area is often numbed first. You should get results within days to a few weeks, depending on the test.

Treatment

Many cysts need no treatment at all. If a cyst is small, painless, and not changing, your doctor may simply suggest keeping an eye on it. Treatment is offered when a cyst is painful, infected, growing, in an awkward place, or causing you worry. The right choice depends on the type of cyst, where it is, and your own preferences.

Self-care at home

• Leave the cyst alone — squeezing or picking at it can cause infection and scarring
• Keep the area clean and dry with mild soap and water
• A warm, clean cloth held against a sore skin cyst for a few minutes a few times a day may ease discomfort
• Do not try to pierce or cut a cyst at home
• Avoid tight clothing or straps that rub against the lump
• Take a photo every few weeks if you want to track whether it is changing
• See a doctor if it becomes red, hot, very painful, or starts leaking

Medical treatments

If a cyst is infected, a doctor may drain it in a minor procedure, usually using local numbing medicine, and may prescribe medicine to treat the infection. Some cysts can be treated by draining the fluid with a needle in the clinic. For certain types, a doctor may suggest a small procedure or medicine to shrink the cyst. Your doctor will explain the options, the benefits, and the possible side effects, and you can decide together what suits you.

When is surgery considered?

Surgery may be suggested when a cyst is large, painful, keeps getting infected, keeps coming back after drainage, sits somewhere that bothers you, or when the doctor cannot be sure what the lump is. The usual operation is a small procedure to remove the whole cyst, including its wall, because a cyst is less likely to come back if the wall is taken out completely. This is often done with local numbing medicine, sometimes as a day case. Your doctor will talk you through what to expect, including scarring and recovery time.

Living with this condition

Most people with a cyst simply carry on as normal. You may want to check the lump now and then, note any change in size or colour, and keep the skin around it clean. If a cyst is in a spot that rubs on clothing or jewellery, a small dressing or a change of clothing can help. Knowing what to look out for — redness, heat, pain, fast growth — helps you act early if something changes.

Lifestyle tips

• Keep skin clean and avoid harsh scrubbing or picking
• Wear loose, comfortable clothing over the area
• If you sit for long periods, take regular breaks to stand and move
• Manage acne and skin irritation with gentle skincare
• If you smoke, quitting lowers the risk of some types of cysts and has many other health benefits — ask your doctor or pharmacist for support
• Keep to a healthy weight, which lowers the risk of certain cysts

Diet and exercise

There is no special diet that gets rid of a cyst. Eating a balanced diet and staying active support your general health and help you recover well if you need a procedure. Gentle movement is usually fine with a cyst, but avoid activities that press hard on the area if it is sore, and follow any advice you are given after treatment.

Mental health and emotional wellbeing

A lump can be worrying, even when it turns out to be harmless. Many people feel anxious while waiting for a check or results, and some feel self-conscious if a cyst is visible. These feelings are normal. Talking to someone you trust, writing down your questions before appointments, and asking your doctor to explain anything unclear can all help. If worry is affecting your sleep, mood, or daily life, tell your doctor — support is available.

Prevention

Not all cysts can be prevented, especially those you are born with or that run in families. But some everyday steps may lower your risk: avoid squeezing or picking at spots, treat acne, keep skin clean, avoid tight clothing that rubs, and take breaks from long sitting. If you have had a cyst removed, following your aftercare advice helps it heal well and lowers the chance of it coming back.

Screening programmes

There is no routine screening programme for cysts. The most useful habit is to know your own body and get any new, changing, or unusual lump checked. If you have a condition that causes many cysts, your doctor may suggest regular check-ups.

Complications

If left untreated

• Infection, which can turn a cyst into a painful abscess (a pocket of pus)
• Rupture, where the cyst bursts under the skin and causes pain and swelling
• Scarring or skin changes, especially after repeated infection
• The cyst coming back, particularly if its wall was not fully removed
• Pressure on nearby tissues, which can cause discomfort or, rarely, problems with nearby organs
• Very rarely, a lump that looks like a cyst turns out to be something else, which is why checking matters

Long-term outlook

The outlook for most cysts is very good. Many never cause a problem, and those that do are usually treated simply and successfully. If you have a cyst removed, healing usually takes a short time, and the scar tends to fade over months. Keep an eye on the area, follow your aftercare advice, and see your doctor if anything changes — that way you stay in control and can get help early if you need it.

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