Tiny bumps that feel like sandpaper all over forehead???

only noticable when light or the sunlight beats directly on it.. Ive had this since I was a teenager (10 yrs ago).. and nothing seems to be working.. Well, I did try Proactive and it worked for all about a mth and then made my skin worse... I have sensitive skin but also dry.. I would like to know what I can use that will be very helpful for me.. I just want my forehead to feel soft and flawless for once.. argh!!