Bactrim is a topical antibiotic, the medical name is mupirocin ointment, mainly used for the treatment of folliculitis, acne, etc. If seborrheic dermatitis is accompanied by acne and folliculitis, you can use topical Bactrim for the treatment of the seborrheic dermatitis, but if it is just a simple seborrheic dermatitis, the first choice is not Bactrim. Many scholars believe that seborrheic dermatitis is an allergic reaction caused by Malassezia, that is, fungi, so in the selection of drugs on the choice of antifungal drugs, and tretinoin econazole cream, ketoconazole cream, etc., but also pay attention to the local moisturizing, endocrine factors can also cause seborrheic dermatitis. The cause of seborrheic dermatitis is more complex, so according to the situation to choose different drugs or oral medication for treatment.