Why does the body appear in the dark for no reason?

  When people are in daily activities, the body will inevitably have bumps and bumps. At this time, there will be a blue and purple indigo on the surface of the skin. Generally, after a while, the indigo will disappear. However, some people are not injured by external forces, and the body will also appear bruises. Why is this?
  What is indigo?
  Under the influence of factors such as trauma, if the epidermis does not rupture, the blood seeps out from the “holes” of the capillaries into the skin, causing local blood stasis under the skin, which is called “瘀青”. Indigo has various forms. In medicine, according to the diameter of subcutaneous hemorrhage from small to large, it is divided into defects (bleeding point), purpura and ecchymoses. Freckle is a large area of ​​subcutaneous hemorrhage; purpura is a common type of subcutaneous hemorrhage, between the sputum and ecchymosis. Indigo is usually benign, but in the absence of injury, large areas of the body appear in varying degrees of sputum, freckle, may be a problem with the body’s normal hemostasis.
  There are two types of people who are more prone to indigo: one is female. Compared to men, women have thinner skin and blood vessels are more susceptible to trauma. The second is the elderly. As you get older, your skin becomes thinner and your blood vessels become weaker. This can cause damage to the blood vessels after minor damage, or the blood vessels are less elastic and cannot shrink and close quickly. Therefore, a small amount of bleeding may occur with a slight bump. , leading to indigo.
  Bruise cause
  vascular fragility normal small vascular injury, vascular reflex contraction occurs immediately, so that local blood flow slows down, in order to promote hemostasis. If the vascular fragility is increased and the vasomotor function is abnormal, hemorrhagic purpura is caused by extravasation of blood from the blood vessels, and the most common is allergic purpura. Second, bacterial or viral infections, vitamin C deficiency, chemical factors, etc. can cause damage to the blood vessel wall and cause purpura. In addition, there is an unclear increase in the brittleness of the vessel wall, which is common in women. Purpura can disappear on its own, and there are no adverse consequences, called simple purpura, which may be related to female hormone levels.
  Platelet count and dysfunctional platelets play an important role in hemostasis. If the thrombocytopenia or platelet function is defective, the hemostatic function is weakened or lost, and it is easy to cause purpura. Thrombocytopenia can be seen in idiopathic thrombocytopenia, secondary thrombocytopenia, radioactive substances and chemicals that destroy megakaryocytes and reduce platelet production, and severe infection can cause excessive platelet damage. In addition, hypersplenism, lupus erythematosus, etc. can also reduce thrombocytopenia. Platelet function-deficient diseases such as hemorrhagic thrombocytosis and thrombocytopenia.
  The number of coagulation factors and abnormal function of coagulation factors often cause coagulopathy and lead to purpura, such diseases are less, the cause is mostly congenital, such as hemophilia; a few are acquired, such as liver disease.
  How to deal with indigo?
  If it is bruise caused by bruises, cold application can be used in the early stage to achieve contraction of blood vessels and avoid redness and blueness of the skin; for more than 24 hours, use hot compress.
  If there is no bruises and there is no reason for the indigo, there are the following four situations to go to the hospital for examination.
  1. In the short-term, the range of indigo or indigo in various parts of the body gradually expands and the absorption is delayed.
  2. There are other discomforts in the appearance of indigo, such as fever, joint pain, itchy skin, abdominal pain, hematuria, black stools, nosebleeds, dizziness, fatigue, and yellow skin.
  3. Children and young children have a small bruise or subcutaneous bleeding after a minor injury, and the same is true in relatives.
  4. Long-term use of certain anticoagulant drugs, such as aspirin, warfarin, etc., these drugs have a certain risk of bleeding, more likely to lead to indigo.