It is possible that the itchy and long bun on the foot may be an allergic reaction to the foot, the most common clinical allergy may be papular urticaria, insect bite dermatitis and so on. Topical anti-itch creams can be applied topically. You can apply topical hydrocortisone butyrate cream, mometasone furoate cream, etc. You can also apply topical glyburide lotion, which can play a local anti-itch role. If the itching worsens, you also need to take oral antihistamines, such as the first generation of antihistamines, paracetamol, cyproheptadine, etc., but also with the second generation of antihistamines levocetirizine hydrochloride, Epastine, etc. Avoid scratching as much as possible, because after scratching, the itching may be aggravated by mechanical stimulation, and may cause skin breakdown due to scratching, resulting in secondary infection.