I just take a bath in oatmeal that night to soothe it, and I put Brave Soldier Healing Ointment on it, but I really don't think you can speed up the resolution much, or harm it by being out in the sun again, either. I usually only get it when I'm out all afternoon in really hot temps. I wonder if I get it on that one marathon course, around my ankles, because so much of the course is broiling white sand. I never get it on my ankles otherwise. I think it is temp related as much as sun, which would go along with getting it _under_ the black shorts which are absorbing heat all day...
***********
"...I'm like the cycling version of the guy in Flowers for Algernon." Mike Magnuson