Hypertrophic Navel Piercing Scar. Treatment?

What is the treatment to remove/manage a hypertrophic navel piercing scar? I have double vertical belly button piercings (One on the top and one on the bottom) that I've had for atleast 5 years, the lower piercing only started to form scar tissue this year when I changed the jewelry to titanium when I lost my more expensive sterling jewelry. I used a silicon disk and that didn't help flatten the scar. I can see and feel the scar tissue surrounding the hole where the jewelry was placed.

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