Figure 5 The efficacy of a picosecond laser with different energy in the degree of (A) color fading and (B) area reduction of tattoos. High-energy group: 2.5~2.9 mJ/μbeam; medium-energy group: 1.7~2.1 mJ/μbeam; and low-energy group: 0.7~1.1 mJ/μbeam. For each group, we conducted the picosecond laser procedure twice (labeled as ‘1’ and ‘2’) and collected data for analysis. (A) Demonstrates whether there is a significant difference in color fading between 2 groups. (B) Illustrates if there is a significant difference in color fading area between the 2 groups. The y axis represents the number of rats with ideal tattoo removal effects according to the 3 categories in tattoo pigmentation fading.