Like all medical procedures there are potential side effects. The V-BEAM has been used for over 20 years including treating Port Wine Stains in infants and has a great safety record. The Dynamic Cooling Cryogen Spray goes along way to enhancing comfort and protecting the skin. It is common to experience redness after the treatment. Occasionally, a laser bruise called purpura may occur and dissipates in 3 to 14 days. Crusting of dark spots may also occur and fade over 7 to 14 days. More serious post procedure adverse events include blisters and skin color changes are possible, especially if the Pre & Post Care instructions are not followed.