I have LI and I get that all the time, too. I don't get those comments as much as I used to, though, since I started wearing foundation & makeup--that covers up most of the redness.
Most of the time, I say (nicely) I'm not sunburned, I was born this way, the same thing goes for my hands. Most people just leave it alone then. No more questions and no more comments.
Sometimes I don't feel like getting into my medical history w/ strangers, so I just smile & agree with them, saying something like "I was on my motorcycle all weekend" or something like that.
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If the grass looks greener on the other side, maybe it's time to start watering your lawn!