OK, here comes my patch experience. The best location for a patch is over fatty tissue, it seems that the transfer rate into the blood stream is the best in those locations.
My employer makes almost any of the patches out there, which means, we make the base material and adhesive, and pharmaceutical companies add their medication. Transdermal patches are used for almost a million different medications as the vehicles to get the medication into the blood stream without undo burden on the stomach.
I placed my first patch on my lower belly, just a little higher than the pubic hair. This is probably one of the more sensitive skin areas of the body. I got a pretty bad skin reaction after a few days, with a lot of blistering. It took over a week for the skin to heal again. I applied the next patch to the inside of my upper thigh, this resulted in a mild skin reaction. I worked with the manufacturer of the patches (the pharmaceutical company), because I had the suspicion that some faulty adhesive was used. We established a way that I could receive patches from a different manufacturing lot, and mine went back for QA testing.
I applied the new patches to my back just above the buttocks, and I did not have an adverse skin reaction. But the skin is not as sensitive in this area either.
I would strongly recommend to any patch user, to apply the patches in the are over the buttocks, to avoid any nasty skin reactions!