Pea size lump with tenderness & swelling under ring finger ?

Tendinitis : You likely have a tendinitis of the extensors and flexors of your finger. This is a common condition. Your doctor should be able to tell if further testing is necessary. Treatment consisted of anti-inflammatories weather injected into the area or taken by mouth. Please see Command Weiss by your doctor. He may also refer you to a rheumatologist.