Lumps and bumps in piercings happen for a few reasons but the number one cause for the lumps and bumps is misuse or over use of cleaning products. These come with various names, Bactine, Dragon Mist, Pierced ear solution and various other names but actually the bumps or lumps and not Keloids but actually Hypertrophic reactions.
This is where the tissue freaks out due to the irritantand inflames with a build up of collagen The solution to this is simple, stop using all cleaning products on your piercing and just irrigate the piercing daily with running water while moving the jewellery back and forth.
This will flush the irritant out of the piercing and allow the tissue to settle down, now this will take several days to a week or two depending on how bad the lumps or bumps are but this solution works without fail. So do that and your issues should resolve themselves in a few days.
It is most likely an enlarged lymphnode and it is best to not mess with it because it will only make it worse. The swelling of it will go down if you don't toy around with it.
http://www.pacificbodyjewellery.com/aftercare/infected_piercing.htm
As you would without a navel piercing, just be sure the navel piercing is the last thing you clean before you exit the bath.
Your question "Can navel piercing migration be down to growth" makes no sense.
She can still keep her navel piercing in.
If it hangs or dangles chances are good that it will retain a piercing. Placing the navel piercing off to the side will be problematic for aftercare and irritation during the healing process. If you haven't had a navel piercing before then stay with something that is simpler to care for and will give a result a navel piercing is supposed to give.
Navel piercing could cost anywhere between Rs 350 and 500 with navel jewelery done by experienced piercer.
If you want to wear a regular navel ring in your inverse piercing, turn the navel ring upside-down, so that the larger gem is in the navel, and the smaller gem is below.
it is a plastic piece you put in to retain your navel piercing
Navel
yes you should be concerned wth just a lump above your belly button. so go to the doctor and get it looked at.
There is no direct evidence of historical navel piercing, although there is a great deal of historical evidence regarding the decoration of the navel, both for ritual and aesthetic purposes.
No, injection and topicals tend to swell the navel area and bugger up the tissue so that getting the piercing aligned properly is a pain in the neck. Why bother the perceived pain of getting the piercing done is at a point that you want anesthetic for it, maybe navel piercing isn't for you.