Willow - don't worry about it. I have BRIGHT RED cheeks all the time. I could replace Noddy at the drop of a hat.
Often get strangers in Morrison's asking me if I'm 'alright' with most people thinking I'm a raving alki. It doesn't really get any worse on the bike, in fact, it's less noticeable because the rest of my face/neck has matched the cheeks

. When I've had a wash etc, I cool down and then apply some cover up.
There is cover up make-up you can get but in your situation, I wouldn't bother because the blood flow is temporary and will die down. At the end of the day, you LOOK (and I assume FEEL) healthy!!!