I have been losing weight and now my belly button is getting more and more irritated

Ever since losing 40 pounds over the years the area of my bellybutton has been gradually growing more irritated. It has been always feeling odd when i press my bellybutton, but pressing it now hurts. When i press the bellyfat from both sides of the bellybutton, and then press my fingers towards each other, squeezing the bellybutton, the bellybutton starts to hurt when my fingers are 2 inches apart. Should i be worried, or is this normal?

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