Extensive or limited bleeding under the skin and mucous membranes, forming red or dark red discoloration of the skin and mucous membranes, about 3-5 mm in diameter or larger, and those larger than 5 mm are called petechiae. Most of them suggest blood disorders, or diseases causing bleeding and clotting abnormalities. The causes of skin petechiae are complex and varied, and treatment is mainly directed at the primary cause. How to prevent skin petechiae daily? 1.Remove possible allergens 2.Pay attention to rest and avoid strain 3.Pay attention to keep warm and prevent cold. 4.Avoid mood swings and prevent insect bites. 5.Avoid taking drugs that may cause allergy. 6.Control and prevent infection, use sensitive antibiotics when there is a clear infection or infection foci, but should avoid blind prophylactic use of antibiotics. 7, pay attention to diet, forbid raw onion, raw garlic, chili, alcohol and other irritating foods; meat, seafood, eggs, milk and other high animal protein foods; drinks, snacks and other convenience foods.