Belly button piercing infected?

So I pierced my belly button around 4 years ago, I took it out around 2 years ago and just left it. Today I’ve just noticed that if I pull the skin back you can see a lump and puss coming out the hole..is this infected? Or should a few salt washes help this? The hole on the bottom is completely closed up. The puss smells bad🤢

Does anyone have any tips that might help this go away?

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