Everol Conti advice please

I was told I could apply the patches to my upper arm, which my friend does. However, I prefer to slap them on my bottom. I put one on the left cheek on a Wednesday and then one on my right cheek on a Saturday.

As far as I understand, it’s better to apply patches to the lower abdomen or buttocks. Not actually sure why this is, probably due to blood supply, fat and muscle, bone distribution. If they don’t stick there are different preparations available.