Red hair is a relatively rare trait, occurring in approximately 1-2% of the global population. It's caused by a mutation in the MC1R gene, which codes for the melanocortin 1 receptor. This receptor plays a crucial role in producing the pigment melanin, responsible for hair color. The mutation leads to the production of a different type of melanin, resulting in red or yellow hair.
Certain infections, including those transmitted sexually like gonorrhea, chlamydia, and syphilis, can cause anal or rectal symptoms along with fever. redhead anal fever