A lot of red envelopes suddenly appeared on my body, as if I had been bitten by a mosquito, but it was not a mosquito. They are very itchy. Who can tell me what they are?

It should be skin allergy caused by mites, which needs to be checked in a hospital.

Skin allergy is an allergic reaction of the body and an abnormal reaction of people to normal substances (allergens). Allergies only occur when allergens come into contact with people with allergies. Allergies include pollen, dust, foreign protein, chemicals and ultraviolet rays.

Allergic mediators play a direct role in allergic reaction. Allergens are the external cause of allergic diseases, but the immune ability of the body is low, and the oxidative damage of a large number of free radicals to mast cells and basophils is the internal cause of allergies.

Causes of skin allergy

1, external cause

Including diet, inhalants, climate, exposure to allergens and so on. Among them, seafood, protein, spicy food, wine, inhaled pollen, dust mites, cold weather, exposure to chemicals, soap and detergents are the most common causes of skin allergies.

2. Internal factors

Allergic substances combine with bronchial mucosa, nasal mucosa, skin and blood vessels, leading to allergic rhinitis with sneezing and runny nose, allergic asthma with asthma and pruritic dermatitis. In the process of allergic reaction, allergic mediators play a direct role, allergens are the external causes of allergic diseases, while the body's immune ability is low, and the oxidative damage of a large number of free radicals to mast cells and basophils is the internal cause of allergies.