Scratch urticaria symptoms?

summary

Scratch urticaria is an allergic reaction of skin and blood vessels. The formation of allergic reaction is caused by both internal and external factors. There is a special protein in the serum of this kind of patients, which is immunoglobulin IgE. If this kind of protein combines with allergen, the body will cause a series of reactions, and finally lead to the mast cells around the skin blood vessels to release a large amount of histamine. Histamine will cause the expansion of skin blood vessels, and the serum will seep out of the blood vessels, which will produce pruritus. Scratch urticaria symptoms? Let's talk about it

Scratch urticaria symptoms?

Simple scratch urticaria, more common in women, belongs to physiological physical abnormalities. The symptoms are rubella after the skin is scratched by nails or other blunt objects, most of which have no itching or other discomfort.

Another kind of scratch urticaria is called symptomatic scratch urticaria, which is common in young people with allergic constitution. The main reason is that the skin is allergic to external physical stimulation, which makes mast cells release histamine bioactive substances, causes skin capillary dilation, enhances permeability, and makes plasma and tissue fluid penetrate into the dermis.

People suffering from this kind of scratch urticaria often feel itchy skin for no reason, but unlike the common urticaria, there are rubella lumps all over the body. When the skin is scratched with nails or other blunt objects, there are many rubella puffs in the local area, and then the puff edema rises above the skin, and there is a halo at the edge of the rubella puff, Its shape is very similar to the mark left by the whip on the skin. Some patients with severe symptoms even after the lip is bitten by teeth will appear lip swelling symptoms.

matters needing attention

1. The patient should pay attention to the allergen at ordinary times. If a certain food or drug allergy is found, it should be stopped immediately, and the suspected allergen should be avoided as far as possible. 2. Cut short nails, do not scratch, otherwise it can cause skin lesions increased significantly, severe itching. 3. Keep defecation unobstructed, constipation can take fruit guide tablets 2, 2-3 times a day, an senna leaf appropriate amount of boiling water. 4. Keep the room clean and dry, forbid flowers, and do not spray chemicals such as Lysol and dichlorvos to avoid sensitization. 5. Drivers and high-altitude operators are forbidden to use chlorpheniramine, diphenhydramine, antale and other anti allergic drugs during work to avoid accidents due to dizziness and drowsiness.