Red itchy skin after being bitten by black ants may be caused by allergy to insect venom or secretion, which can be treated by oral and topical medications. 1. Oral medication: preferred second-generation antihistamines, such as loratadine, cetirizine, etc., which have good anti-allergic effects and low probability of side effects. 2. Topical medication: Glycolite lotion, mint and phenolic products can be used externally to relieve itching; if the redness, swelling and itching are heavy, glucocorticoid ointment can be used externally, such as mometasone furoate cream, etc. The above medications should be used under the guidance of a physician. The above drugs should be used under the guidance of a physician, if the symptoms are more serious, please go to the hospital in time.