Worsening "Ghosting" vs. Hyperpigmentation with PicoSure? (Photo)

I have received 4 treatments with PicoSure for an unwanted deltoid tattoo, with 2-9 months between treatments. Much to my dismay, I seem to be experiencing worsening "ghosting" or hyperpigmentation with each treatment (thoughts on this?). The overlying skin reddens with light exfoliation and feels slightly raised. I have recently been using silicone sheets to promote healing, and am hesitant to get more treatments due to this problem. What is the best way to resolve this issue? Thank you!

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