What is the reason for the middle finger nail depression?

The middle finger nail depression, this single nail depression is more common in two cases: one is nail depression, similar to eating a spoon, clinically known as spoon nail. Generally related to systemic diseases, most common is iron deficiency anemia. Patients can test serum iron levels. If lower than normal, iron can be supplemented. At the same time, vitamin C can be taken orally to promote iron absorption. Generally speaking, iron supplementation 2-3 months later, a depression symptoms will be significantly improved. Second, subungual proliferative disease is usually a benign tumor under the nail. The tumor mass will compress the nail mother, resulting in nail depression. The hospital can use B ultrasound to check the nature of the tumor, if necessary, surgery to remove the tumor, reduce nail depression.