Usoro ọgwụgwọ nke Q-Switched Nd:Yag Laser Therapy Systems dabeere na laser nhọrọ photothermal na ịgbawa ọkụ nke Q-switch laser.
Ụdị ike dị ogologo na ogologo ogologo ogologo ga-arụ ọrụ na ụfọdụ radicals agba ezubere iche: ink, carbon particles sitere na dermis na epidermis, ụmụ irighiri pigmenti exogenous na melanophore endogenous sitere na dermis na epidermis.Mgbe a na-ekpo ọkụ na mberede, ụmụ irighiri ihe ndị dị na pigmenti na-agbawa ozugbo n'ime obere iberibe, nke macrophage phagocytosis ga-eloda wee banye n'ime usoro mgbasa ozi lymph ma mesịa pụta n'ime ahụ.