Wrist weights have been around for decades ... other users have warned they've developed issues like tendonitis from strapping on the weighted wristbands. "Initially, it's one of those things ...

Tendonitis does not typically cause a lump on the wrist. Conditions that can cause a lump on the wrist include a ganglion cyst, a carpometacarpal boss, or rheumatoid arthritis. A person may ...