"The Science of Social Rejection: Why We Avoid People Who Scratch"

Researchers are delving into the science of itch, discovering itch-specific neurons and pathways that could lead to new treatments. It's believed that mammals evolved the sensation of itch as a reflex to expel pathogens, but there's also a psychological aspect, as evidenced by contagious scratching in humans and monkeys. There's evidence to suggest that humans and other mammals are hardwired to avoid itchy individuals, possibly due to the signal of infestation or infection. Sufferers of chronic itch often face stigma and mental health challenges, and while scratching provides temporary relief, it can exacerbate the itch-anxiety cycle. The pleasurable sensation of scratching is not fully understood, but it may involve pain signals, distraction, and the release of serotonin.