It's relatively rare to see a redhead — just 1% to 2% of humans are natural gingers. So, you might do a double-take if you see a man sporting a reddish or even a full-blown red beard, even though he ...

The same condition that causes dandruff -- seborrheic dermatitis --also can cause a red and itchy beard. AndreyPopov Getty Images/iStockphoto If the skin under your facial hair is often red, irritated ...