Why are some of your beard hair glow red?

Some beard hairs may appear red due to genetic factors that influence pigmentation. The presence of pheomelanin, a type of melanin responsible for red and yellow tones, can cause certain hairs to reflect light differently, giving them a reddish hue. Additionally, variations in hair color can occur even within the same individual's beard due to differences in hair follicles and their respective pigment production.