I suddenly got red spots on my body and it was itchy. What's going on?

Disease is a very common situation in people's daily life, because many factors in people's daily life can cause the occurrence of diseases, especially skin diseases. Sudden red spots and itching on the body are a relatively common disease, but many people are not clear about the cause of this disease. So, what's the matter with the sudden itchy red spots on the body?

First, why do red spots suddenly appear on your body and make it itchy? Food. The most common foods are fish, shrimp, crab and eggs. Secondly, certain spices and condiments can also cause it. drug. Penicillin, sulfonamides, furazolidone, serum vaccines, etc. often cause urticaria through immune mechanisms. Drugs such as aspirin, morphine, atropine, and vitamin B1 are histamine releasers that can directly cause mast cells to release histamine and trigger urticaria. ,Infect. Including viruses (such as influenza virus, hepatitis virus), bacteria (such as Staphylococcus aureus), fungi and parasites (such as roundworms, etc.). Plants and animals. Such as insect bites or inhalation of pollen, feathers, dander, etc. Physical factors. Such as cold, heat, sunlight, friction and pressure can cause it. In addition, gastrointestinal diseases, metabolic disorders, endocrine disorders and mental factors can also cause it.

Second, acute urticaria. Acute urticaria often has an acute onset, with itching, wheals, and rashes all over the body, and may be accompanied by high fever. In severe cases, blood pressure drops or even shock occurs. The disease will heal naturally within 1 to 2 weeks and should be actively treated. Chronic urticaria. Chronic urticaria is a disease that often has no known cause. Patients often develop red, swollen and itchy rashes on their bodies, faces or limbs from time to time. The more they scratch, the more itchy and swollen they become. The frequency of attacks ranges from several times a day to once every few days. The severity of the disease and the onset of the disease may vary greatly from person to person. Cholestatic urticaria is a type of what people commonly call urticaria. It often occurs in adolescence when the body temperature rises slightly due to heat, mental stress, intake of hot food or drink, or after exercise. The increased blood flow stimulates the brain's temperature regulation center, excites the choleretic nerves and releases acetylcholine. The symptoms will subside after you stop exercising or calm down. In severe cases, it may take months or even years for the symptoms to completely subside. Cold urticaria. An allergic reaction caused by the human body being exposed to a cold environment. Edema and wheals often occur in areas immersed in cold water or in contact with cold substances. It is more common on the face and hands, but may also affect other parts of the body. The patient may feel itchy and may also have systemic symptoms such as headache, skin flushing, and low blood pressure. In severe cases, shock may occur.

Why do red spots suddenly appear on my body and it is very itchy? Papular urticaria. Papular urticaria is an itchy skin disease that often occurs in infants and children. The skin lesions are often round or fusiform wheal-like lesions, with needle-sized to bean-sized blisters on the top, distributed scattered or in clusters. It often occurs on the extensor side of the limbs, trunk and buttocks. Generally, the skin lesions will disappear on their own after several days to a week, leaving temporary pigmentation spots. Skin lesions often appear in batches and last for a period of time. This disease causes severe itching and may cause pyoderma due to repeated scratching. Peptone urticaria. If you eat too much at one time (excessive consumption of pork and seafood), and are mentally agitated and drink a lot of alcohol, peptone can be absorbed into the blood through the intestinal mucosa and cause illness, resulting in skin congestion and redness, wheals, headaches, and fatigue. Solar urticaria. The main symptoms are local itching, erythema, wheals, and angioedema that occur rapidly after the skin is exposed to sunlight for a few seconds to minutes and last for 1 to 2 hours. It is more common in women. Skin scratching. Also known as artificial urticaria. After scratching the skin with hands or scratching it with a blunt object, strip-like protrusions will appear along the scratches, accompanied by itching, which will soon subside. It may occur alone or in combination with urticaria. Can occur at any age. There is often no obvious cause, but it can also be caused by drugs (especially penicillin). Pressure urticaria. It occurs after the skin is subjected to heavier and longer-lasting pressure for 4 to 6 hours. Diffuse, unclearly defined edematous painful plaques occur in the compressed area, involving the skin and skin tissue. It is more likely to occur on the palms, soles and buttocks and usually lasts 8 to 12 hours. Sometimes it may be accompanied by chills, headache, joint pain, and general discomfort. The pathogenesis is related to kinins.