How to get rid of my belly button keloid? (photos)

I got my belly button pierced on October 22, 2015 and I got it taken out on Valentine's Day the following year I thought it was infected because it itched so much and my skin was getting dark around it ... When the piercer took it out she said it was a keloid & I would need tea tree oil to make it go away but half of it only went away , & I'm still embarrassed by my scar!