Mucous Cyst Info
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Mucous cysts – common bumps near finger joints, often linked to arthritis, and treatment options.
What you're feeling
You likely notice a small, fluid-filled bump on the top of your finger joint. This bump is a mucous cyst, often linked to wear-and-tear arthritis in the joint. The skin over the cyst may look thin or stretched. You might feel a dull ache or a tight sensation right where the cyst sits.
The pain often gets worse when you use your finger for gripping or pinching tasks. Reaching behind your back to fasten a bra or tucking in a shirt can become difficult. You may find it hard to sleep on your side if the pressure on that hand wakes you up. Some people feel the discomfort is worse in the morning or after a long day of activity.
Your surgeon will look at how the cyst affects your daily life. While the cyst itself is usually not dangerous, it can make simple movements uncomfortable. The main goal is to remove the pressure and the underlying bone spur causing the problem. Once the bone spur is gone, the skin often heals well on its own without needing complex repairs.
What's actually happening
A mucous cyst is a small fluid-filled sac that forms on the top of your finger joint. This joint is wrapped in a tough sleeve called the joint capsule. Inside your finger, the smooth coating on your bone ends is called cartilage. Over time, wear-and-tear arthritis can cause a bony bump, known as an osteophyte, to grow at the edge of this joint. Think of this bump as a small rock that pushes against the joint capsule.
This pressure creates a weak spot in the capsule. Fluid from inside the joint leaks out through this weak spot and gets trapped under the skin. The result is the cyst you see and feel. The skin over the cyst often becomes very thin because of this constant pressure. Removing the bony bump is key to stopping the leak, as removing just the cyst without fixing the bone often leads to it coming back.
Your surgeon will remove the cyst and the bony bump to stop the fluid from leaking again. This approach treats the root cause rather than just the symptom. In many cases, removing the bone alone is enough to make the cyst disappear completely. If surgery is needed, your surgeon may use a small flap of skin to cover the area, which helps the skin heal well without losing movement in your finger.
What we can do about it
Many mucous cysts do not need immediate surgery. You can try simple self-care and see if the cyst settles on its own. Your physical therapist will guide you through gentle exercises to keep your finger moving. They aim to reduce stiffness and improve how your joint works. Give this approach a few weeks to see if it helps. If the cyst is painful or limits your movement, we will move to the next step.
If self-care does not work, your surgeon may suggest a medical injection. We can use a corticosteroid shot placed directly into the joint space. This injection is easy to place and helps reduce swelling and pain. It also lowers the risk of skin damage or infection compared to other methods. The effect of the injection can last for several months, giving you relief while your joint heals.
Surgery is considered only when conservative care has reached its limit. Your surgeon will remove the cyst and the bone spur causing it to stop it from coming back. This procedure is designed to be simple and effective with a very low chance of the cyst returning. Most patients are happy with the result and would choose to have the surgery again if needed.
When to see someone
See your GP if you have persistent pain that does not improve with rest. Ask for a specialist review if you notice weakness, instability, or if your finger locks or gives way. Seek help if symptoms interfere with your sleep or work, or if you experience sudden worsening. While many cases resolve with less invasive methods like removing bone spurs, professional advice ensures the best outcome for your joint and skin.
