What is one of the side effects of laser hair removal?

One of the side effects of laser hair removal is extended redness. This is a common reaction to the treatment, as the laser targets the hair follicles and can cause temporary irritation to the surrounding skin. The redness typically subsides within a few hours to a few days, depending on individual skin sensitivity and the specifics of the procedure.

In contrast, the other options do not accurately reflect the common side effects associated with laser hair removal. Scarring can occur, but it is relatively rare when the procedure is performed by a qualified professional. Weight gain is unrelated to laser hair removal and is not a side effect of the treatment. Hair thinning is also not a direct side effect of laser hair removal; rather, the intention of the procedure is to permanently reduce hair growth. Therefore, extended redness is the most appropriate response when considering the common side effects experienced after laser hair removal.