Suggest Remedy For Pimples On Temple

I have a flat dark spot spreading from sun-temple to eye corner now. I knew many years ago (more than 10, maybe), I had a pimple that was not taken care of, so the pimple dried down by it self. A few years later, a soy bean sized dark spot appeared, and I went through laser treatment, then the dark spot came back again with a bigger size after maybe two years; laser treatment again, the dark spot continued to come back with larger size. I want know why and was wondering if there is any better treatment option to cure this? Thank you!