The appearance of pinpoint red dots on the arm may be caused by mechanical stimulation, or it may be caused by follicular keratosis, allergic purpura, vascular nevus and other pathological factors.
1. Mechanical stimulation: when the arm skin is hit by external forces, scratching and other mechanical stimulation may cause small subcutaneous hemorrhages, manifested as pinpoint red dots, if there is no other abnormality, generally can be gradually faded, observation can be.
2. Pathologic factors:
(1) follicular keratosis: mostly related to heredity, may also be vitamin A metabolism disorders, sun exposure, etc., can be manifested as pinpoint red dots on the arm, and accompanied by flaking and other symptoms.
(2) allergic purpura: can be induced by many factors, such as infection, food, drugs, etc., resulting in capillaries and small blood vessels wall and its surrounding produce severe, so that the arm skin blood vessel rupture thus caused by the pinpoint-like small blood spots, the pressure of the color of the legs not.
(3) vascular nevus: mainly caused by abnormal proliferation of vascular endothelial cells or abnormal structural development, etc., which can also be manifested as symptoms of pinpoint-like small red spots on the arm.
It is recommended that the patient consult the doctor in time, improve the blood routine and other tests, identify the cause of the active treatment under the guidance of the doctor, and at the same time should pay attention to the arm skin clean, so as not to delay the condition.