Laser hair removal side effects can include temporary skin irritation, redness, and swelling, which usually subside within a few hours. There might also be changes in skin pigment, either darkening or lightening, which can be temporary or permanent, particularly if you don't avoid sun exposure before and after treatment. Rarely, more severe effects like blistering, crusting, scarring, or changes in skin texture may occur. It's less effective for light-colored hair, and not suitable for eyelid or surrounding areas due to the risk of severe eye injury.