Which of the following is a common indicator of successful laser treatment?

Reduced hair density in the treated area is a common indicator of successful laser treatment because effective laser hair removal works by targeting hair follicles with concentrated light energy. This energy damages the follicles, which inhibits their ability to grow hair. Over the course of several sessions, clients typically notice a significant decrease in the amount of hair in the treated area, demonstrating the effectiveness of the treatment.

In contrast, scarring and discoloration typically indicate an adverse reaction to the treatment, while swelling and blistering can be signs of irritation or overreaction of the skin to the procedure. Increased hair growth in surrounding areas is generally a sign that the treatment was not effective, as it is expected that laser treatment should reduce hair growth not only in the intended area but also minimize any unintended stimulation of hair growth.