Coral reef burn

I was snorkeling 5 weeks ago at Las Gatas and was on my back side when I scraped coral. It burned only at that moment so I forgot about it. The next day I noticed the area had 4 red streaks and thought maybe I missed sunscreen in that area. Two days after it looked like the area was burned like from a hot iron.

I got cream at pharmacy that did nothing. Here it is weeks later and It does not appear a whole lot better. Was dry for awhile and flakey but now red and brown. I saw a dermatologist in Morelia, but not sure she gets it as she had me using fancy creams that do not appear to help. Unfortunately, not knowing, I did not scrape the coral out or use vinegar and am beginning to wonder how long I will have this issue since it was not treated properly initially.

Anyone experience this? Treatment? Could have been jellyfish, but I remember scraping coral. Maybe something on the coral?

Thx.

Barb