What physical change occurs to a lesion targeted in laser treatment for hair removal?

In laser treatment for hair removal, the targeted lesion often experiences flattening as a result of the thermal effect produced by the laser. The laser light is absorbed by the pigment in the hair follicle, leading to a localized heating effect that damages the follicle. This targeted destruction leads to a reduction in follicle size and prominence, resulting in the flattening of the lesion and a smoother skin surface over time.

This physical change is crucial for effective hair removal because the flattening indicates that the hair follicles are being successfully targeted and diminished, ultimately leading to a reduction in hair growth in the treated area. The other options, while possible side effects or reactions of skin to different treatments or conditions, do not accurately describe the primary physical change associated with effective laser hair removal treatment.