Done for acne scars. Collagen P.I.N used. 0.5 used on forehead, 1.5 on cheeks, side of face 1.0. Dermatologist recommended it. Licensed esthetician did it (12yr exp.) @ the office. Post tx plan: induction therapy products (makers of the p.i.n) including serum q1h day of tx, then days following use cleanser bid, apply phaz serum, apply dewet moisturizer & intensive care cream for bruising. Sunscreen primer prn. What else can I do to speed up heeling? This looks terrible & I'm so upset.