Is there any specific oral medication for seborrheic dermatitis in the scalp?

This needs an in-person evaluation. I suggest seeing a hair loss expert now to evaluate and go over your condition and provide you information about your best treatment options. Any subsequent hairloss can be treated with options like prp/progesterone and/or hair transplantation. See an expert. Best, Dr. Emer

For this particular condition it is better to be seen by a dermatologist to determine which treatment method is right for you. Typically this is treated topically and not orally.

Treatment of seborrheic dermatitis starts with shampoos, including those with ketoconazole, zinc pyrithione, selenium sulphide and ciclopirox. In resistant cases, isotretinoin or itraconazole can be used and have been studied. These pills are generally prescribed by a dermatologist. Anyone interested in these medications needs to have a good chat about how they are used and potential side effects of these medications. Follow up is needed.

There are no good, reliable  oral medications for the treatment of Seborrheic Dermatitis. The treatment is topical with shampoos and other topical agents