Ganglion cyst: This is the most common type of lump found on the wrist or hand, often appearing on the finger. It is a benign cyst filled with a jelly-like fluid and is usually harmless, though it can cause discomfort or pain, especially if it presses on a nerve.

Epidermoid cyst: Also known as sebaceous cysts, these are benign cysts that can appear on the fingers. They are usually filled with a cheesy, white material and can become inflamed or infected.
Mucous cyst: Typically found on the fingers, especially near the fingernail, mucous cysts are small, fluid-filled sacs that can cause discomfort and may lead to nail deformity.
Digital mucoid cyst: Similar to mucous cysts, these are benign lesions that contain a thick, jelly-like substance and are often found on the fingers, particularly near the joints.

Squamous cell carcinoma: Although rare, a cyst on the finger could potentially be a sign of skin cancer, such as squamous cell carcinoma. Early detection is crucial for effective treatment.
Infectious abscess: An abscess on the finger, which could initially present as a cyst, requires prompt medical attention to treat the underlying infection and prevent further complications.
Osteoid osteoma: A benign bone tumor that can cause pain and swelling, which might be mistaken for a cyst. It's essential to diagnose and treat this condition to alleviate symptoms.

Glomus tumor: A rare, benign tumor that typically occurs under the fingernail. It can cause pain, especially to pressure or temperature changes, and may be mistaken for a cyst.
Synovial sarcoma: A rare type of cancer that usually occurs near the joints of the arm, neck, or leg but can also appear on the fingers. It's crucial to consider this in the differential diagnosis due to its potential severity.
Dermatofibroma: A rare, benign skin growth that could be mistaken for a cyst. It usually appears as a firm, round, brownish to purple growth, often on the legs but can occur on the fingers.