Allergy to cactus can be relieved by staying away from cactus, washing with water, applying glycerite lotion, and taking the oral antihistamine loratadine. 1. Stay away from cactus: Some patients may be allergic to cactus, so in order to prevent the symptoms of allergy from worsening, you should try to stay away from cactus, and the symptoms can be relieved after the triggers are removed. 2. Wash with water: After cactus allergy, you can use water to wash, can effectively remove the cactus juice on the hands, and then improve the itching and other symptoms. 3. Apply glycerine lotion: By applying glycerine lotion, you can also achieve the purpose of astringency and stop itching, but there is no definite therapeutic significance. 4. Oral antihistamines: Patients can also take antihistamines such as loratadine and cetirizine orally to improve the symptoms of cactus allergy. If the symptoms of cactus allergy are severe, it is recommended to go to the hospital immediately to avoid delay.