Hey, Junior, long time no hear! It's possible dirt may have gotten closed in your pores? Do you wash your bed sheets/pillowcases regularly? Do you wear a hat, and if so is it clean? What do you wash your scalp with? Maybe a doctor or dermatologist could give a better answer, but a lot of times when pores close up it leads to ingrown hairs which may cause your bumping problem...Good Luck!