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The Q-switched ruby laser had the highest clearance rate in blue-black tattoos and the highest incidence of long-lasting hypopigmentation. The Nd:YAG had no incidence of hypopigmentation.

Our results suggest that CO2 laser resurfacing produces immediate tissue contraction and residual thermal damage that is saturable for multiple passes and high fluences. For small fluences, however, there is an almost linear increase in thermal damage and shrinkage with an increasing number of passes.