Keloid Hypertrophic Scarring with Thread Lift Using PDS Sutures?

I am with 1 of the best facial reconstruction surgeons in London. I am a 27 yr old Caucasian female who has suffered previously from keloid and hypertrophic scarring, My surgeon has informed me that he has never seen a case of anyone to scar from this procedure as the needles run through the fat. The only place that might scar is the incision in the hair line. Has anyone ever experienced hypertrophic scaring through the thread lines? If not, why does it not scar when the collagen forms?

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