what is this red grid mark on my back? i woke up with it and it’s been on my back for about 3 days. no pain and there’s no raised bumps. i didn’t even notice it till my friend pointed it out

http://bit.ly/2WCBF93

Submitted May 28, 2019 at 04:43PM by callie143 http://bit.ly/2MfY5sv