Once the distance holder of the laser handpiece is placed on the skin and the laser is activated via the foot switch, a light impulse is sent, resulting in a pricking feeling. The handpiece of the laser moves over to the other areas to be treated. The treated area will display blisters and appear white, which some call the “popcorn effect” immediately after treatment. A strong sensation of wheals or warmth or redness of the skin may occur following treatment. The treated areas may darken and a small crust may form after a few hours, but within a few days should clear up.