Recently, several laser systems have been developed for epilation by selective photothermolysis of the hair follicle. These include the long-pulsed ruby laser, the long-pulsed alexandrite laser, the Nd:YAG laser, and the diode laser.1- 5 The principle of selective photothermolysis predicts that the thermal injury will be restricted to a given target if there is sufficient selective absorption of light and the pulse duration is shorter than the thermal relaxation time of the target.3 Many of these systems claim to be safe and effective for a wide variety of skin types and anatomic areas with only infrequent adverse effects. We report an unusual adverse effect after laser epilation.
Wimmershoff MB, Hohenleutner U, Landthaler M. Isomorphic Phenomenon: Adverse Effect After Epilation With the Long-Pulsed Ruby Laser. Arch Dermatol. 2000;136(12):1570-1571. doi: