IPL, or intense pulsed light treatments, rarely cause any type of scarring of the skin. A keloid is a scar that becomes hypertrophic or grows larger than the original scar. Keloids not only widen on the skin, but often protrude out from the skin. Rarely, IPL treatments could cause some blistering of the skin in certain areas. WIth newer devices available, it is rare to see scarring of any type with IPL treatments. IPL should be used with great caution in dark skinned individuals because dark skin is very sensitive to the effects of IPL, and scarring is more likely in these individuals.