Darkening of finger joints may be caused by trauma, hyperpigmentation, friction and disease.
1. Trauma: trauma to the joints of the fingers leads to local capillary rupture bruising symptoms will occur when the joints of the fingers, the symptoms will be gradually recovered after a period of time.
2. Hyperpigmentation: after the occurrence of dermatitis, eczema and other diseases in the joints of the fingers will be due to the sequelae of inflammation leading to hyperpigmentation, at this time there will be the symptom of blackened joints.
3. Friction: If the blackened finger joints are often subjected to repeated friction, the skin tissue in the area will become black, hard and other protective reactions.
4. Disease: Diseases such as fixed drug rashes and diabetes can cause blackened knuckles due to disease factors, which need to be treated promptly.
Finger joints black may also have other causes, it is recommended that the patient to the regular hospital room consultation, clear cause, symptomatic treatment.