Swollen and itchy fingers may be caused by allergic dermatitis, insect bite dermatitis, hives and other diseases, which can be treated by oral medication. 1. Allergic dermatitis: Allergic dermatitis is related to contact with allergic substances, and catching allergic substances will trigger an allergic reaction in the body, thus leading to swollen and itchy fingers. It is necessary to get rid of the allergic substances in time and take antihistamine drugs, such as cetirizine hydrochloride tablets, loratadine tablets and so on. 2. Insect bite dermatitis: caused by mosquito bites, the lesions at the beginning of the micro-red papules, followed by green beans or peanut size slightly fusiform red doughnut-like damage, which can lead to swelling and itching of the fingers, can be used topically to relieve itching, such as glycerine lotion, zinc oxide, camphor cream or topical glucocorticosteroids and so on. 3. Urticaria: a limited edema reaction due to the expansion of small blood vessels in the skin and mucous membranes and the increase of permeability. Topical antipruritic agents, such as glycerine lotion, zinc oxide powder, camphor cream or topical glucocorticoids. Swollen and itchy fingers may have other reasons, it is recommended that patients go to the hospital to do a comprehensive examination, follow the doctor’s instructions standardized treatment, do not self-medication.