It is due to closed comodones. Looks similiar to below and found on cheeks and forehead.
This can be caused due to comedogenic products or dandruff. I would suggest to follow double cleansing at night and do exfoliate with only chemical exfoliaters with aha/bha twice a week. Never use harsh physical scrubs on this, it can cause scarring. Search for a non comedogenic moisturiser like cosrx rice mask.
I faced this similar issue on my forehead it was mainly due to the dandruff for me. Using head and shoulders shampoo helped with that.
Hope this will help. Thanks.