Problem description:

Recently, I woke up in the morning and found red blood spots on my eyelids, as if I had been beaten. There was no pain, no swelling in the hands, and the blood spots were distributed in granules, which gradually subsided after 2 days. Later, there was a red blood spot on my arm, just like the one on my eyelid, which was granular and connected into a small piece. I can't feel it without pain. After 2 or 3 days, it slowly recedes.

What is the cause of this sudden subcutaneous blood spot?

Analysis:

Subcutaneous hemorrhage, medically known as purpura, is a purple-red spot, indicating that the blood is under the skin and will not fade when pressed. The bleeding point with a diameter less than 2 mm is called a bleeding point; Purpura is caused by bleeding with a diameter of 2 ~ 5 mm; Ecchymosis with a diameter greater than 5 mm; A flaky hemorrhage with obvious protuberance is a hematoma. People inadvertently cause subcutaneous hemorrhage due to trauma in their daily lives, which will generally be gradually absorbed; However, if it is hemostasis dysfunction, subcutaneous hemorrhage can occur with a light touch, or spontaneous subcutaneous hemorrhage can occur without injury. The causes of subcutaneous hemorrhage are as follows:

Vascular factors: skin and mucous membrane bleeding caused by congenital or acquired defects of blood vessel wall. For example, hereditary hemorrhagic telangiectasia often bleeds repeatedly in the same place because of the increase of local fragility of blood vessels; Henoch-Schonlein purpura is a capillary allergic disease. Because the antigen-antibody complex is deposited on the blood vessel wall, it causes capillary dilation and increased permeability, leading to purpura or bleeding. The elderly are prone to senile purpura because of loose tissue and increased fragility of blood vessel wall.

Platelet factor: Platelets play an important and complicated role in hemostasis. When the quantity or quality of platelets is abnormal, it is often easy to lead to skin and mucous membrane bleeding, and in severe cases, visceral bleeding may occur, such as digestive tract, urinary tract, respiratory tract, uterus and even cerebral hemorrhage.

Coagulation and anticoagulation factors: insufficient coagulation factors or excessive anticoagulation factors in the blood can also cause a large area of ecchymosis on the skin, but it is generally common in deep hematoma or joint bleeding.

Subcutaneous hemorrhage often occurs, which often indicates hemorrhagic diseases. Patients should go to the hospital in time to further find out the reasons and treat them according to the reasons.