Hi. seems to be a case of Severe dandruff(Seborrheic dermatitis
). In this condition one has itching in the scalp
and yellowish/greasy adherent scales which bleed/ooze serum when removed and crust again.
stop using hair oil if you are already using
Use a 2% ketoconazole
shampoo/Nizral shampoo thrice weekly
Take an oral antibiotic like Amoxycillin/Augmentin
for a week for the bumps