Many arrive hoping for instant results, which aren't always possible. "Flat scars respond faster, while thicker ones may take up to 15 sessions. "It's a journey, not a quick fix," Dr Kapoor explains.

I'm 45 and recently saw a photo of my face from the side — gasp! I was most surprised by some old acne scars that I can't see when I look in the mirror straight-on. What is the current advice on ...