MH - please advise, PUSS is coming out of my son's belly button.

I have a 4.5 years old son. When he was born, his belly button was partially outtie. (it had couple small 'outties' pertruding, they look independent, like two small berries inside of the button hole). Well, few days ago I noticed something white on the tip of the largest 'outie'. I didn't pay attention to it, thought it was just dirt or cotton ball. Today, he came up to me and said that something white and stinky coming out of his belly button.
I pressed on the 'outtie' and it squized out white puss (foul odor, white creamy substance). My son said it didn't hurt (he doesn't have a fever). It reminded me of puss that can come out of a pimple.
I squeezed some of it out (not all of it), the 'outie' became partially deflated (when in the past it was round and tight). I decided not to squeeze out everything in case, and put some alchohol on it and idine, bandaid.
Does anyone have any ideas what it is, is it dangerous, should I completely clean it out. Could it be that those parts of his belly button never got completely healed, and now after 4.5 years they are getting healed. I'd appreciate any advice, thank you.


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