The skin on the body is not the same as the skin on your face. It doesn't matter where you test it, but it's better not to do it on the nose as it heals differently as well. If you want to go for a spot that is less noticeable, I would go for near your ear or your jawline.

Btw, can you please put your post under the same topic and not open a new one every time? This is really annoying.