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Ask your doctor for medications to reduce the inflammation. Use a prescription-strength antibacterial. Discuss using an antifungal medication together with other medications. Discuss an immunomodulator with your doctor. Try light therapy combined with medication.
The doctor may prescribe creams or ointments for short-term use, as some of these may make your skin thinner if used over a long period of time:  Hydrocortisone creams Fluocinolone Desonide (DesOwen, Desonide) A common one contains metronidazole (MetroLotion, Metrogel) which can be obtained as a topical cream or gel. Apply it according to the manufacturer’s instructions or as directed by your doctor. If your doctor thinks a fungal infection may be preventing healing, this may help, particularly if areas under a beard or moustache are affected:  Alternate an antifungal shampoo with a weaker steroid, like hydrocortisone, desonide, fluocinolone. Try an oral antifungal like terbinafine (Lamisil); however, this medication may cause serious allergic reactions and liver damage. These medications reduce inflammation by suppressing the immune system; however, they may potentially increase your risk of cancer. Common ones have calcineurin inhibitors:  Tacrolimus (Protopic) Pimecrolimus (Elidel) The medication, called psoralen, makes you more sensitive to ultraviolet light. After taking it, you are given light therapy to treat the seborrheic dermatitis. The side effects of this treatment may be serious, including burns or discoloration of the skin.  You may have an increased risk of skin cancer. If you get this treatment, you should wear UV-protective sunglasses to avoid eye damage and cataracts. This treatment may not be appropriate for children.