Scratch urticaria

There are thousands of diseases, and scratch urticaria is one of them. Scratched urticaria is an uncommon disease. The formation of scratch urticaria is the combined effect of internal and external factors. The internal factor is that the person himself must have an allergic constitution, and there are many external factors. There are allergens in the food. Some people may be allergic to wheat flour and milk. People with allergic constitution should pay attention in their daily life.

Some commonly used antibiotics, athlete's foot, pollen in the air, air pollution, etc. can all be the causes of scratch urticaria. For people with allergies, there are also a lot of allergens in the outside world. What kind of disease is scratch urticaria?

There are two types of scratch urticaria:

One type is called simple scratch urticaria, which is more common in women and is a physiological abnormal physical reaction. The symptoms are wheals that appear after the skin is scratched by nails or other blunt objects, most of which do not cause itching or other discomfort.

Another type of scratch urticaria is called symptomatic scratch urticaria, which is common in young people with allergic constitution. The cause of its occurrence is mostly due to the allergic reaction of the skin after external physical stimulation, which causes mast cells to release biologically active substances such as histamine, causing the skin capillaries to dilate, the permeability to increase, and the plasma and tissue fluid to penetrate into the dermis. People suffering from this type of scratch urticaria often feel itchy skin for no reason, but unlike the common urticaria, they do not have wheals all over the body. Instead, when the skin is scratched with nails or other blunt objects, erythematous wheals appear locally first, and then the wheals swell up above the skin, and red halos appear at the edges of the erythematous wheals. Their shape is very similar to the marks left after the skin has been whipped with a whip. Some patients with severe symptoms may even experience swollen lips after their lips are bitten by teeth.

Prevention is worse than treatment for any disease. People with allergic constitution must observe carefully in their daily life and try not to eat allergic foods, such as fish, shrimp, crab, etc. They should also pay attention to some details in life, cut their nails short and smooth, scratch itchy areas as little as possible to avoid the incidence of scratch urticaria.