Hair on only one armpit

[1shotcappuccino]

DS is 12. He only has armpit hair under one arm. Puzzled ??

No idea on that one sorry OP. How long has he had the hair in one armpit?

A few months at least

This is a little embarrassing but this happened to me too! I started with hair on one armpit first and a few months later it grew on the other. Lol so I think it's very normal. I had to shave one underarm for months when I was about 12