Sunburn. Blisters. Abrasions. OUCH. Help?

During my first day of surf camp this week, the backs of my thighs were severely sunburnt. (They hurt like *$%#^@!! that night) When I went surfing again today, I took a spill on a huge wave and the surface of my soft-top board (it's sandpaper-like) scd off a layer of the burned skin in a small spot on my leg, leaving it raw, moist, and VERY stinging/painful. There are blisters all around as well. :-( Sorry to be gross with the descriptions, but what's the best thing to do for this? Should I put something on it?