I have begun treatment for the mites, but I have now found a worrying mark near it's eye that I haven't seen before and want to make sure it isn't anything serious.

snakes (1 of 4) by sildargod, on Flickr
Above the left eye is a reddened and tight patch of scales which I didn't pick up initially. Is it something to worry about? You can also see the blistering I mean on his head - the darkened patches of scales. Also, does it look dehydrated? I am soaking every day, but I haven't seen it drink at all which I am putting down to stress.
Thanks!
Kaleem
