Symptoms: Tight, thickened skin on the fingers that often appears shiny and can make bending your fingers difficult.
What it may mean: Scleroderma, a condition characterized by a buildup of collagen in the skin, causing skin tightening and thickening.
Treatments: Physical or occupational therapy, if skin thickening makes movement difficult; ointments and lotions to help soften skin. Other problems, including Raynaud’s phenomenon, calcium deposits under the skin and difficulty swallowing, often go along with skin thickening and will require their own treatment.

Symptoms: A finger that gets stuck – especially when your first wake up in the morning – and is painful when you try to extend it; painful clicking or snapping when you try to flex the affected finger.
What it may mean: Trigger finger, a condition that happens when the tendons that move the fingers thicken or become inflamed. Tendons in the hand are like ropes that move the fingers; these ropes run through tunnels, or sheaths, that hold them in place. If the tendon – or the sheath through which it moves – becomes thickened, movement can be difficult. Bending the finger may pull the swollen portion through the narrowed sheath, making a popping or snapping noise and causing pain.
Treatments: Use of a splint to keep the finger straight, or in more severe cases, nonsteroidal anti-inflammatory drugs, or NSAIDs, steroid injections and/or surgery to loosen the tendon sheath.

Symptoms: Painless bending/curling of the fingers toward the palm of the hand.
What it may mean: Dupuytren’s disease, a condition in which the connective tissue under the skin of the palm of the hand becomes thickened, eventually forming tough bands, or cords, of tissue, which can cause the fingers to bend toward the palm. This is called Dupuytren's contracture.
Treatments: Splints, an injection of an enzyme called collagenase to break up the cord, or surgery to cut the cord.

Symptoms: Tingling, numbness, weakness, or pain felt in the thumb, index finger, middle finger, thumb side of the ring finger and/or palm. You may have symptoms in one hand, or if both hands are affected, they may be worse in one hand.
What it may mean: Carpal tunnel syndrome, a condition in which swelling of tissues in the wrist puts pressure on the median nerve, which supplies movement and feeling to the thumb side of the hand. In severe cases the nerve can become irreversibly damaged, permanently affecting hand function.
Treatments: A splint to support the wrist, hot and cold compresses, oral NSAIDs, corticosteroid injections directly in to the wrist and, in some cases, surgery to release the compressed nerve.