What are the skin changes / side effects of laser hair removal?

Few. If done correctly, laser hair removal is safe and effective, with few skin changes. Blistering and pigmentary changes can occasionally occur.
Pigment change, scar. Laser hair removal is generally a safe and effective procedure. However complications can occur. These include a change in the pigmentation of the skin, either lighter or darker, and scarring. Darkening of the skin is usually temporary. Patients with a tan and darker skin types are at more risk. See an experienced dermatologist or aesthetic physician in order to minimize risk of complications.