I had noticed tan lines from my helmet on my forehead and figured there wasn't much to be done about it. However, it's gotten sillier. I have tan lines from the straps on my helmet too. So I have these bright white lines continuing on from my sideburns. Now, being obese and working out a lot tends to leave me red faced a lot, but this explains why it's been so much more noticeable lately.
In looking at ways to not look so red faced I was pointed to sunless tanners. I found a particularly interesting question/answer on Yahoo answers, keep reading farther down.