The itchy thighs with a lot of small bags is hives, belonging to artificial urticaria, is an allergic skin disease, once found in this situation, it is recommended to go to the hospital dermatology department to check the allergens to see. If you have allergens, you should try to avoid contact with them in the future. If you have artificial urticaria for a short period of time, you can take oral anti-allergy medication, such as levocetirizine tablets, and use topical glyburide lotion and Bute ointment. If the disease is not good for a long time, and the duration of the disease is more than six weeks, it belongs to chronic urticaria, it is recommended to take Chinese medicine to regulate, usually the bath water should not be too hot, do not eat spicy, seafood, beef and mutton, in addition, some chronic urticaria is related to the stomach and epigastric H. pylori, if accompanied by stomach and epigastric discomfort, it is recommended to go to the hospital to check H. pylori.