Is it possible to improve the bumpy skin troubles on my forehead?

I sweated a lot during the hot summer. In particular, the excessive sweating on my forehead caused my pores to widen, and I developed many small, bumpy protrusions. They don't pop with my hands; my skin just feels rough and bumpy, and they haven't gone away even now that autumn has arrived. Since my forehead is an exposed area, it looks unsightly if I examine it closely. I'm not sure if this is acne or if there is a problem with my skin. I have uploaded a photo. It does look like acne, but I am wondering if it is treatable. I would also like to know what treatment methods are available, how long the treatment will take, and whether they will disappear with treatment.