OK, my friend and i were wondering why body hair “knows” to grow back? We thought if you shave it there may be some biological reason in the skin that triggers it to grow back,BUT…
What abuot if you cut the hair in half. For example, an arm pit hair that is 2 inches long is trimmed not shaved to a length of 1 inch. Is there some magical reason the hair grows back?
Body hair is constantly growing, just like head hair. The difference is that body hairs grow to a certain length, then stop growing and become dormant for a period, then the hair falls out and the cycle repeats. Different hairs run different cycles so at any given time, roughly half the hairs are growing, while half are dormant.