Hello and welcome to healthcaremagic The problem that you mention is commonly seen in those who have an excess of oil secretion or oily scalp. This can manifest as seborrheic dermatitis(itchy greasy adherent scales in the scalp) and also as itchy bumps. A yeast called Malasezzia furfur which is a common commensal (resident flora) is responsible for initiating or perpetuating inflammation as it feeds on the oil that is produced. The goal is to keep the scalp as clean as possible and not to use any hair oil. An Oral antifungal rather than oral antibiotics, specially Itraconazole 100mg capsules, 2 capsules once daily(after meal) for a week would help in seborrheic dermatitis and itchy bumps over the scalp by decreasing the resident flora(Malasezzia furfur) which is implicated as one of the factors for causing scalp seborrheic dermatitis and itchy bumps. I would suggest that you use a 2% ketoconazole shampoo once daily or every alternate day as well. Ketoconazole is antiinflammatory antifungal as well as antiseborrheic. Lather it well into the scalp skin and leave it for 5 min before you rinse. Regards