There will be a lot of bumps when you grasp it, but there will be no bumps when you don’t grasp it
This generally belongs to mild urticaria. Urticaria is an allergic reaction, which is caused by poor immune function and sensitivity. If it can disappear by itself, the symptoms are lighter. It is best to check the allergens and make it clear that staying away from the allergens in the future can reduce or avoid similar allergic reactions.
After reading the pictures you sent, there are many small papules on the skin, accompanied by obvious itching. Considering allergic skin lesions, you can go to the local regular hospital for blood tests and check the allergens. During this time, you should avoid taking spicy and stimulating food orally, taking anti-allergic drugs orally, and observing symptomatic treatment.