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Good that you have mentioned all that you have already tried.They do work for seb dermatitis
.One thing that you have not mentioned is isotretenoin tablets.This tablet is excellent for excess oil secretion and acne
,but needs lot of precautions and blood investigations.Otherwise its a safe and good drug.Most important of all in this is that one should not get pregnant during the course of the medicine.Talk in details about this medicine with your dermatologist
.You can also try cyclopiroxiolamine shampoo for the same.Try topical steroids
too which are safe and good.