Digital Myxoid Cyst

Mucous Cyst (Finger/Toe)

Overview

A digital myxoid cyst (also called a mucous cyst or digital mucous pseudocyst) is a benign, fluid-filled cyst that typically develops on the dorsal surface of the finger near the distal interphalangeal (DIP) joint or at the base of the nail. It is filled with clear, viscous, gelatinous fluid (mucin) and is often associated with underlying osteoarthritis. The cyst may cause a groove or dent in the nail if it presses on the nail matrix.

Key Symptoms

  • Small (5-10 mm), dome-shaped, translucent or skin-colored papule or nodule
  • Located on the dorsal finger between the DIP joint and the nail fold
  • Firm or fluctuant, containing clear, gelatinous fluid
  • May cause a longitudinal groove or dent in the adjacent nail
  • Usually painless but can be tender if inflamed
  • May spontaneously drain clear, sticky fluid

Affected Areas

Fingers (dorsal surface near DIP joint), Base of fingernail, Toes (less common)

Care Instructions

  1. See a dermatologist for evaluation and to confirm the diagnosis.
  2. Avoid puncturing or draining the cyst at home due to risk of infection.
  3. Repeated gentle compression or firm pressure massage may occasionally resolve the cyst.
  4. Cryotherapy, intralesional corticosteroid injection, or surgical excision are treatment options.
  5. Recurrence is common with non-surgical treatments.
  6. If associated with osteoarthritis, management of the underlying joint condition may help.

Medical Disclaimer: This information is for educational purposes only and does not replace professional medical advice. Always consult a qualified dermatologist for diagnosis and treatment.

Prevalence: Common; most frequently seen in adults over 40, especially women