serious question, I have a natural tan. got it a few weeks ago. BUT, spent some time in the sun for…

serious question, I have a natural tan. got it a few weeks ago. BUT, spent some time in the sun for the last few days and I didn't get sunburn, but I am really itchy on my shoulders, upper arms, chest and upper back. any ideas? I plan to see a doctor if it doesn't resolve in a week because I'm constantly scratching and my skin is starting to tear open. like I said, there's no sunburn there, just the tan I got weeks ago at the street fair in june...