Whats my pigs problem?

I have two pigs. A duroc and a yorkshire. The duroc is thriving nicely but my Yorkshire is not. Its sunburned and just constantly is scratching its body everywhere. I imagine related to the sunburn. He was doing fine til this past week. The temps have been decent but they also knocked their water out of the ground so they didn't have constant water for a few days. I gave birth so we were a bit distracted but at least it was a cool week. Tonight I went out there and I told Dh that the pig is looking not so great. Its skin is wrinkly and a bit saggy and its appetite is not there.it ate for a few minutes but seemed disinterested... its acting depressed..

is it sick or is it mopey from wanting a wallowing hole?