Photorejuvenation is actually the use of pulses of intense light on the skin with a cosmetic treatment, its function is to eliminate / lighten the skin various pigmentation spots, enhance skin elasticity, eliminate fine wrinkles, improve the expansion of the facial capillaries, improve the facial pores and skin roughness, but also to improve the yellowing of the skin color and so on. So photorejuvenation is not harmful.
However, individual human beings are very different. People who are allergic to light, have local and systemic inflammation, immune system defects, scarring, have recently used photoallergic drugs, pregnant women, blood clotting irregularities and are using aspirin or antioxidants are generally not suitable for photorejuvenation.