Nails & Lips
Digital Myxoid Cyst
Digital mucous cyst
Common, often in older adults
No — you cannot catch it or spread it
Benign; can be treated but may recur
What Is It?
A digital myxoid cyst is a small, harmless, fluid-filled bump near the last joint of a finger or toe, close to the nail. It contains a thick, jelly-like fluid and is linked to the nearby joint. It's benign, but it can press on the nail root and cause a groove or ridge in the nail.
Signs & Symptoms
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A small, dome-shaped, translucent bump near the nail
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Thick, clear, jelly-like fluid if it drains
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A lengthwise groove or dent in the nearby nail
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Usually on a finger, sometimes a toe
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Often linked with arthritis in that joint
Why Does It Happen?
These cysts are related to wear-and-tear (osteoarthritis) changes in the nearby joint. Fluid from the joint pushes outward and collects under the skin, forming the cyst. They are more common in older adults and in fingers affected by arthritis. They are NOT cancerous and NOT contagious.
Treatment Options
Many cysts are simply observed. Treatment is considered if the cyst is painful, drains repeatedly, or causes nail deformity, but recurrence is common with simpler methods.
OBSERVATION
Reasonable for a small, painless cyst that isn't bothersome.
REPEATED DRAINAGE
Draining can help temporarily, but the cyst often returns.
CRYOTHERAPY / INJECTION
Freezing or steroid injection may reduce recurrence in some cases.
SURGERY
Removal offers the best cure rate for persistent or troublesome cysts.
Tips for Managing It at Home
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Avoid repeatedly popping or draining it yourself (infection risk)
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Protect the fingertip from bumps and trauma
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Understand that nail grooves improve once the cyst resolves
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Know that simpler treatments have higher recurrence than surgery
When to Call Your Provider
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The cyst becomes red, warm, or painful (possible infection)
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It drains fluid repeatedly or won't heal
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A worsening nail deformity develops
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You'd like it evaluated for definitive treatment
Sources & further reading
The information in this handout is based on general dermatology guidance from the reputable organizations below. These links are provided for patients who wish to read more from trusted sources.
DermNet. Digital Mucous Cyst. https://dermnetnz.org/topics/digital-mucous-cyst
Canadian Dermatology Association (CDA). Nail Health & Care. https://dermatology.ca/public-patients/diseases-conditions/nail-conditions/general-information/
Cleveland Clinic. Digital Mucous Cyst. https://my.clevelandclinic.org/health/diseases/digital-mucous-cyst
MSD/Merck Manual. Cutaneous Cysts. https://www.msdmanuals.com/professional/dermatologic-disorders/benign-skin-tumors-growths-and-vascular-lesions/cutaneous-cysts
This handout is for general education and does not replace advice from your own provider. Always follow your provider’s specific instructions.
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