A large bleeding dot on the wrist usually refers to skin petechiae, which may be caused by trauma or allergic purpura.
1. Trauma: for example, localized compression and trauma, resulting in capillary rupture and bleeding, may occur.
2.Allergic purpura: belongs to a kind of small vasculitis, usually associated with infection, drugs, vaccination and other factors, the patient’s skin in the small blood vessels and capillaries are damaged, the red blood cells extravasation into the skin, the appearance of pressure does not fade the color of the small blood spots.
In addition, skin petechiae can also be seen in other causes, it is recommended that when this situation should be timely to the hospital, under the guidance of the doctor to actively cooperate with the relevant examination and treatment, so as not to delay the condition.