it stayed fairly stable for most of my teens/20s, then it started spreading. it's all over my hands, elbows, knees, ankles (joints), as well as my face, my entire forehead and all around my eyes. I try not to get too much sun, so the edges aren't clearly defined. there are steroid creams you can try, but they had no effect on mine. there also used to be a stain that was a thin liquid, you could painstakingly apply it with a Q-tip. I used that on my hands for years. now I just wear fabulous jewelry, hehe.
as you get older, it won't bother you as much. trust me.