Ultraviolet RaysLasersLightScattering, RadiationLaser Therapy, Low-LevelTolonium ChloridePhotosensitizing AgentsPhotochemotherapyUltraviolet TherapySpectrophotometry, UltravioletLaser TherapyRadiation EffectsHematoporphyrin DerivativeDose-Response Relationship, RadiationLasers, SemiconductorPUVA TherapyInfrared RaysMesoporphyrinsErythemaSunscreening AgentsHematoporphyrinsLasers, Solid-StatePhotochemistryMicroscopy, UltravioletFiber Optic TechnologyGamma RaysSunlightSpectrum AnalysisOptical FibersLaser CoagulationHematoporphyrin PhotoradiationSkinMethylene Blue