Cranberry, either a folded up piece of gauze or a torn off piece of cotton wool, secured with whatever kind of tape your skin is happy with should be fine. But if you apply pressure for a minute or so, you may find baby doesn't need anything stuck over anyway.
Oh, and I'd bought a tennis ball for DH to use to massage my back so his hands wouldn't get tired. It stayed at home in my birth box in the end....to be used next time!