I shall ask my doctor about it, perhaps a different brand is in order. I'll also ask her if it's OK to wear it elsewhere. Back of the shoulder is not ideal for me due to hair and acne/eczema/rash/whatever, and I can't reach it very well.
Currently I have it on my lower back, as it wasn't sticking so great on the lower abdomen.
In the meantime though, I'm going to have to tape it down so it doesn't fall off and I go onto my fourth patch in just over a week when the box was supposed to last me a whole month. Would also have to move up my reeval and blood test up nearly another month (shiver)