Edema and itching of the face and hands may be caused by mosquito bites, contact dermatitis and urticaria, which need to be analyzed according to the symptoms. 1. Mosquito bites: After being bitten by mosquitoes, insects and other animals, toxins enter the skin and a series of symptoms such as redness, edema and itching will appear locally. 2. Contact dermatitis: after contacting the substances to which they are allergic, patients may experience a series of allergic reactions on the face and hands, such as edema, redness, itching and other adverse symptoms. 3. Urticaria: Urticaria is caused by food, infection, drugs, respiratory tract inhalants and skin contacts, etc., and limited edema occurs in the dermal mucosa due to the temporary increase in vascular permeability. When urticaria occurs on the face and hands, adverse symptoms such as edema and itchiness will occur. Face and hands edema itching may also have other causes, should promptly go to the hospital for examination and diagnosis, and under the guidance of the doctor to choose the corresponding treatment.