Plucking hair may cause hair growth
If you want to grow hair back, you may have to put up with some pain. Researchers at the University of Southern California have found that by plucking 200 hairs in a circular pattern on mice, they were able to get 1,300 new hairs to grow back.
These scientists had previously discovered that damaging a single hair follicle will also cause damage to the area around the follicle. They believed this reaction could stimulate new hair growth in other follicles.
To test this, the researchers plucked 200 hairs in different patterns on the backs of mice, to see if any new hair would grow back. While certain, low density patterns - wider than 6 millimeters - did not cause new hair growth, plucking the hair in a smaller, high density circular pattern caused anywhere from 400 to 1,300 new hairs to grow. Plucking from a smaller region even caused new hair growth in areas beyond the area where the hair was plucked.
The researchers, who published their findings in the journal Cell, surmised that plucking hairs in a small region causes distress that signals an immune response, and releases enough inflammatory proteins to signal new growth in hair follicles.
They concluded that there's enough evidence to justify more research into the potential of this approach for curing hair loss.