Bags on the body are itchy like mosquito bites may be caused by insect bite dermatitis, urticaria and so on. 1. Insect bite dermatitis: insect bite dermatitis is considered to be caused by mites, bedbugs, mosquitoes and other insect bites. The patient will have the manifestations such as wind bumps, pimples, ecchymosis, itching and so on. If the patient has insect bite dermatitis, there will be a long bag on the body is itchy like mosquito bite symptoms. 2. Urticaria: At present, the exact cause of urticaria has not been found, and it is mostly considered to be caused by infection, drug factors, physical factors, mental factors and so on. The patient will appear red red wind, itchy skin, angioedema and other manifestations. If the patient has urticaria, it can be manifested as itchy bags on the body like mosquito bites. It is recommended that patients with itchy bags like mosquito bites need to consult a doctor in a timely manner, the doctor will choose targeted measures according to the cause of the treatment.