Green spots on the inner thighs may be caused by coffee spots, local trauma, abnormal blood clotting function and so on. 1. Coffee spot: green spot may be a brown or light brown patch due to the increase of local melanin, which may be related to genetic factors, and may appear after birth or soon after birth, and increase in size with age. 2. Local trauma: due to trauma and other factors, the skin of the inner thigh is damaged, the capillaries are ruptured, and the blood is pooled under the skin, resulting in bruises. 3. Abnormal coagulation function: such as hemophilia and other coagulation factor deficiency, there will be symptoms such as subcutaneous bruises. It is recommended to go to the hospital for examination in time to clarify the cause of the disease. After ruling out bruises caused by trauma, you should go to the hospital in time for examination.