My only experience with repeatedly plucking the same hair is limited to one follicle on my forehead. I have/had one blond hair that was almost the same thickness and growth rate as a head hair that grew about an inch down from my hairline. I've been plucking it every month or two for the last ten years. Within the last few months I think it has FINALLY given up! I haven't seen it for 2 or 3 months now and the last couple times it grew in thinner. It was a persistent little sucker!