There is often a small strip rash on the back of the hand, like being bitten by a mosquito, but it usually doesn't itch, and occasionally itches a little. What is this?

If the surface of the lesion is raised, the possibility of urticaria should be considered when the lesion subsides. Urticaria is a systemic allergic disease, which is a skin disease characterized by wheal caused by allergen stimulation, including skin scratches, cold urticaria, cholinergic urticaria, solar urticaria and stress urticaria. The principle of treatment is antiallergic and symptomatic treatment, such as the use of sedatives and antiallergic drug loratadine. But first of all, we must remove the cause and prevent the stimulating factors from continuing to act on the human body. Most urticaria without allergens are stubborn.