Welcome to healthcare Magic
A word of advice in the beginning, Do not comb wet hair, it is traumatic to the hair. Always comb after drying.
It appears like you have developed an early infection of your hair follicle, we call it folliculitis
. This could have been triggered by the vigorous combing by which bacteria gained entry into the hair root. Most of the time it will subside by itself. If you have any antibiotic cream like mupirocin
you may apply it thrice a day over the bumps.
Hope this helped