dead skin, discoloration, blue-ish coloration, very dark skin all around the cock, any of these issues means one of two things. 1) You’re doing too much PE, or 2) you’re good blood circulation.
Try dropping off your PEing by half the time and see if that doesn’t help. Also, try to your genital area warm as much as possible…I know in Canada it’s probably hard to do :D …and take warm/hot showers/baths, be sure to warm up your area down south both before AND after PEing (and actually, taking a hot shower after PEing is a great way to ensure that you will have good bloodflow down there), just think of all sorts of things you can do to keep that area warm and comfortable.
Also, something I notice helped a lot with me is wearing boxers instead of boxer-briefs/briefs. For some reason, I seem to have less circulation issues when I let it all hang down. =) Maybe that will help some.
Also, this should go without saying, but eat healthy. I’ve noticed my own PEing has really kicked ass ever since I started putting back the chips, cokes, candies, and other crap foods at the grocery store, and started replacing them with good healthy foods. The better you eat, the better your bloodflow will be (generally), so maybe this can help you out as well.
Above all, if your situation doesn’t clear up, even after trying all of the stuff mentioned in this thread, I would suggest laying off of PE for a while…sometimes we just overwork ourselves and have to give it a break…if you don’t, your nerves/skin cells in your dick might actually die and that means a perma-flaccid cock. Kinda defeats the purpose of PEing doesn’t it? Heh.