Hello the most common cause of dandruff
like lesion on scalp in this age is seborrhea
capitis a fungal infection
. I would like to know if there are rashes
on face, ear or other parts of body.
Application of antifungal with mild steroid helps in improvement.
Persistence of this lesion may cause abnormal hair growth
. I would request you to attach an image so that I better able to help you out.