The argument for being cut for a PA for the need to be clean, is the same for getting cut for hygiene reasons in general..... no need at all, though if you do get cut, be best to get that out of the way first and all settled in, before going for a PA.
The piercing fact sheet link I thrown up earlier, explains how to keep yourself clean, and is pretty much the same you would do, to keep ear piercings clean.
As it is, PA care, is actually easier than caring for ear, mostaly down to the fact, your own piss is sterile to yourself, and does a fantastic job of general cleaning, though you do need to use unsented soap (DO NOT USE Anti-Bacterial soap, or scented soaps etc, as it prolongs the heeling process), and sometimes, some warm salt water to bathe.
You will find this will last a max of a month, but it's very important especially in the early stages, to be clean as possible.
One other thing (As the fact sheet tells you), you can not fuck / wank until the PA has heeled enough (Normally 4 / 6 weeks, but took me just 3 weeks) much as you want too, with the ring getting you excited (I gave in to temptation, after just 10 days!).