I just wondered if anyone knew why? Is it because that bit of the skin is softer/thinner so it will be absorbed easier? I’m presuming it shouldn’t go on the inside arm as there’s a risk it would rub off on your boobs which is a no-no.
A friend was told to put it on her outside legs (which it doesn’t say in the instructions) and there are menopause doctors online who say the bigger the area you put it on, the better, so it’s absorbed better.