Digital Mucous Cyst (Myxoid Cyst) - Symptoms, Causes & Treatment
Medically reviewed by Dr. Anand S. Urhekar, MD, MD Pathology, Clinical Advisor · Last updated July 2026
A benign cyst containing clear jelly-like fluid, sited on the last finger joint or beside the nail fold. It arises from degenerative change in the underlying joint and can press on the nail matrix, producing a lengthwise groove in the nail plate.
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Quick Answer
A digital mucous cyst is a small, dome-shaped, jelly-filled lump on the last joint of a finger or beside the nail fold, usually linked to osteoarthritis in that joint. Pressure on the nail matrix produces a lengthwise nail groove that resolves if the cyst is treated. Options range from observation and repeated drainage to cryotherapy, sclerotherapy and surgical excision, which has the lowest recurrence rate.
Symptoms
- Small, smooth, translucent dome-shaped lump 5–10 mm
- Located over the distal finger joint or nail fold
- Clear sticky jelly discharges if punctured
- Longitudinal groove in the adjacent nail
- Usually painless, occasionally tender
Causes & Risk Factors
- Osteoarthritis of the distal interphalangeal joint
- Leakage of joint fluid through a weakened capsule
- Age over 40; more common in women
- Repetitive hand use
Treatment & Management
- Observation if asymptomatic
- Repeated needle drainage with compression (high recurrence)
- Cryotherapy or sclerotherapy
- Intralesional corticosteroid
- Surgical excision with joint osteophyte removal — the most durable option
When to See a Doctor
See a doctor if the cyst is painful, repeatedly bursts, becomes red and hot (infection risk to the joint), or is causing significant nail deformity.
Frequently Asked Questions
Should I pop it myself?
No. The cyst often connects directly to the joint space, so puncturing it at home risks introducing bacteria into the joint — a serious infection. Have it drained under sterile conditions if needed.
Will the nail groove go away?
Yes, usually. Once the pressure on the nail matrix is relieved, the nail grows out normally over four to six months.
Related Conditions
Medical References
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Medical Disclaimer: This information is for educational purposes only and is not intended as medical advice. The content on this page should not be used to diagnose or treat any health problem. Always consult with a qualified healthcare professional for proper medical evaluation, diagnosis, and treatment of your condition.