The big red bags on the feet and itchy, considering the lacquer dermatitis, insect bite dermatitis, etc., mainly drug treatment, according to the specific cause of the selection of appropriate drugs. 1. Lacquer dermatitis: If you come into contact with certain chemicals, such as paint, it will cause an allergic reaction, a big red bag and itchy symptoms, should be sufficient to rinse the skin of the contact area, oral cetirizine, loratadine, local application of hydrocortisone cream, mometasone furoate cream and so on. 2. insect bite dermatitis: this is an allergic reaction to insect bites, common in summer, you can use water and soapy water to wash the local area, with topical halomethasone cream, mometasone furoate cream, etc., the symptoms of the more serious can be oral loratadine, cetirizine, etc.. There may be other reasons for the itchy red bags on the feet, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or treatment. All of the above drugs should be used in accordance with medical advice.