Are FDA-approved hair removal lasers ablative or non-ablative, and what does that imply about downtime?

• A. Ablative; longer downtime
• B. Non-ablative; minimal downtime with transient redness and discomfort
• C. Non-ablative; no downtime
• D. Ablative; negligible downtime

Answer: (B)

Non-ablative lasers heat the hair follicle beneath the skin surface while leaving the outer skin intact. This selective heating targets the pigment in the follicle without removing surface tissue, so you get effective hair reduction with little surface injury. That means downtime is minimal, with only transient redness and mild discomfort that typically resolves within hours to a day or two. Ablative lasers, by contrast, remove surface skin and require longer healing, which is why they’re not used for hair removal. FDA-approved non-ablative hair removal lasers (such as alexandrite, diode, and Nd:YAG) embody this approach, offering minimal downtime with temporary skin irritation.