How Does Body Hair Know When To Stop Growing?

See title. The hair on your head (or your beard, if you have one) will just keep growing.

Not so armpit, chest, etc.

Or do they just fall out very very rapidly?

The Master speaks.

Cecil covered this one: Body hair follicles alternate between active, dormant, a new hair growth cycles. Each follicle has its own clock so it’s not all happening at once.

so

slow

Well I’m a dumbass and possibly a GQ rules violator. Sorry.

Sometimes the hair cycle get messed up, because I have a single hair on my forearm that’s about an inch long. The rest of my arm hairs are 0.25 inch or less.