A reader wrote in with a further suggestion for the woman worried her chin hair is mounting a steady takeover:

Have the chin hair person tested for PCOS (polycystic ovarian syndrome). It’s how mine started, and nipping that shit in the bud is the best way to prevent crazy weight/all-over body hair issues/infertility.

That’s a good idea! I’ve noticed that many, many women I read online have been diagnosed with PCOS over the last five years, and of those women, most had to fight to have their symptoms taken seriously by health care professionals (“Be less fat!”) If you’ve just got some stray chin hairs, this advice probably isn’t for you, but if a few different niggling concerns start falling into place, go get checked out.