Red circles around my baby's eyes!!

Alyson • I have a 1 year old son and currently pregnant again due May 5th 2016 ♡
These circles showed up a couple days ago but it was only a small red line under his eye and I wasn't really worried but now it has gotten worse. What could this be? I'm making him a doctor appointment in the morning. Hes 15 almost 16 months old