<prompt> Which of the following is are the side effect s of using argon laser-HypopigmentationCrustingKeloid formationAll the above  <response>: Ans. is d i.e., AH the above Argon Lasero Wavelength 488 - 514 nmo Penetration depth of 1 mm, which can be increased by coolingo Side effects: crusting and possible blistering of skin, irreversible hypopigmentation, transient hyperpigmentation, punctate atrophic or hypertrophic scats, keloid formation. 