Sometimes a localized infection can either mimic trigger finger or actually cause tendon contraction. If the joints or muscles of your finger become red, warm and significantly inflamed over the course of a few hours or days, then seek immediate medical care because these signs indicate a possible infection or allergic reaction to an insect bite. Treatment consists of incision and drainage, warm saltwater soaks and sometimes oral antibiotics.  Bacteria are the most common infections of the hand and usually the result of untreated cuts, puncture wounds or ingrown fingernails. Allergic reactions to insect bites are relatively common, especially to those of bees, wasps and spiders. A dislocated finger joint can sometimes mimic trigger finger because it's also painful and causes the finger to look bent or crooked. Joint dislocations are typically caused by blunt trauma, as opposed to repetitive strain, so they require immediate medical assistance to reset or realign the finger joint. Following realignment, a dislocated finger is treated much the same as trigger finger in terms of rest, anti-inflammatories, ice and splinting.  An X-ray of the hand can readily identify a dislocated or fractured finger. Other health professionals (aside from your family doctor) who can treat a dislocated finger include osteopaths, chiropractors and physiotherapists. Sometimes the cause of an inflamed, contracted finger tendon is due to a bout or flare-up of rheumatoid arthritis or gout. Rheumatoid arthritis is thought to be an autoimmune condition that aggressively attacks the body's joints, and it requires the use of strong prescription anti-inflammatories and immune system suppressors to combat. Gout is an inflammatory condition caused by uric acid crystal deposits in joints (typically in the feet, but also in the hands), which can affect related tendons and lead to contracture.  Rheumatoid arthritis commonly affects the hands / wrists and can grossly disfigure the joints with time. Your doctor may send you for a blood test to check for markers of rheumatoid arthritis. To reduce the risk of gout, cut down on purine-rich foods such as organ meats, seafood and beer.
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