HI GUYS

i'm kind of freaking out right now, I am doing acupuncture and when hes done he sticks a white icy-hot patch type Chinese medicine on my back (and other spots) every other day.

Last week, I followed instructions and took them off 8 hours later. well now theres a HUGE red brown darker dirty rectangle mark exactly the size of the patch on my back and it looks dirty and it looks permanent. if it burnt me, is it like a sunburn which will go away, or like a curling iron burn which stays dark forever and gets even darker with sun exposure?
WTF im so sad I hate scars.