My belly button has gone all weird; like inflamed & red at the top, but not really sore or anything; just looks rank is all. Have put a pic on- do you think it could be getting infected, or is it the start of a whopping stretch mark or something???
I don't think it's infected, I think that belly stone is too short for the tunnel and its stretching it. From the picture it does not look like there's much wiggle room. If I were you I'd pop to argos and get one of their plastic pregnancy bars, they are made from soft plastic, are flexible and longer to accommodate the growing tunnel.
I get that red scarred like spot at the top of mine when the top ball has been pressing in against the skin. This is the one I got, it cost me 4 quid when I was back in England in April.
https://i74.photobucket.com/albums/i260/ChaoticOtter/Forum%20uploads/36WeeksFront-1.jpg
You'll see there's a bit of room at the top and bottom. I tried to put my other one in (which is like yours at the moment) the other day just out of curiosity and the bar would not even reach the top of the tunnel to put the ball on.