Yes you would definitely get scars and the activity is also very painful, I wouldn't advice you to do it, doing it leave you with a scar and a bruised like mark. Check out this video for more on the effects of the act www.youtube.com/watch?v=d3v6X7TbPG4.
If this is another moronic stunt from youtube then DONT DO IT! Honestly! I dont get you kids! Doing stunningly stupid thing because complete strangers in a video on the internet are doing it? Good grief! Try and make a collossal effort to actually use your brain!
yes i did it yesterday i dont know if it will scar though but i have a red mark on my hand and it is sore it is exciting to do though. ( i wouldnt do it it REALLY REALLY HURTS) im just glad i didnt use my writing hand!
You can get scars if it frost bite is severe enough. see what makes the salt and ice challenge hurt so much is that the salt molecules and water molecules have a very strong positive reaction but they don't have the energy to come together and blend so they take energy from your body causing frost bite.