Finger bruises can be caused by trauma, or by diseases such as scleroderma and systemic lupus erythematosus.
1. Trauma: If the fingers have recently been traumatized, such as crush injuries, impact injuries, etc., it will lead to subcutaneous bruising, followed by the appearance of purple finger belly.
2. Scleroderma: the cause of the disease is not yet clear, research has shown that it may be related to genetics, immune cells and inflammatory factors, viral infections, and chemicals such as formaldehyde and polyvinyl chloride. Its first symptom is Raynaud’s phenomenon, which is manifested as the fingers become pale first, and then turn blue and purple, mostly accompanied by pain and stiffness, manifested as blue and purple finger belly.
3. Systemic lupus erythematosus: The occurrence of this disease may be related to heredity, ultraviolet radiation, chemical reagents, pathogenic microbial infections, estrogen and other reasons. Because the disease will lead to a series of vasculitis manifestations, such as red nodules on the fingers, finger ischemia, etc., so some patients will have a purple finger.
There are many reasons for the bruising of the finger belly, and you should go to the hospital to clarify the specific cause.