Whenever a friend of mine exercises she get's a redness just underneath her eye sockets and on her upper cheeks. The thing is she isn't doing cardio, but weight lifting. The redness usually stays for as little as an hour or sometimes as long as the remainder of the day. Is this normal? is there a way to prevent this or minimize this effect? Also it doesn't seem to cause any physical discomfort. If it helps she's Chinese and in her early 20's.