Just like any other treatment, laser hair reduction has minor side effects, most commonly redness, swelling, and discomfort. All of these last for about 1-3 days. Other potential, rare side effects include infections, scarring, blistering, skin lightening or darkening, and cold sore outbreaks. A dermatologist informs about these side effects while detailing laser hair reduction to the client during the initial consultation. If you want to minimise the risk of having such side effects, it is recommended to properly follow all the pre and post-treatment instructions provided by the dermatologist.