The eczema on the buttocks may be as follows: 1, may wear tight chemical fiber shorts. 2, the application of allergy-prone body wash or soap. 3, may be doing salt bath, milk bath caused by allergic reactions. 4, the application of blood-stasis ointment after trauma to cause allergies. For the above situation, you can take oral loratadine capsules one capsule every night, combined with levocetirizine hydrochloride capsules one capsule every morning for oral use, and topical medication can be applied with dinaide ointment 1:1 with black bean distillate ointment for application. During the treatment period, alcoholic beverages should be avoided, as well as spicy and irritating foods, including raw onion, raw garlic, chili pepper and mustard.