A while back my belly button went rotten. I sort of forgot it was down there and didn't scrub it out for awhile. This was a serious problem because some nasty pongy belly cheese built up and scrubbing it out made by belly button nice and clean, but, red and inflamed. Actually this was almost as painful as the time sand/friction/coral ripped off a chunk of my left nipple while surfing. Now I make it my policy to swish a finger around in the ol' belly button every time I take a shower, no further problems have been reported. I supposed people with outies are not as susceptable to this issue. However, outies are fugly in my opinion.