Effect of 82% Lactic Acid in Treatment of Melasma

Table 2

Change in MASI score and percentage improvement by lactic acid.

Time interval	Improvement	% improvement	𝑃 value
0–2 weeks	0.170	5.893	0.752
0–4 weeks	0.515	17.851	0.331
0–6 weeks	0.760	26.343	0.151
0–8 weeks	0.890	30.849	0.079
0–10 weeks	1.000	34.662	0.056
0–12 weeks	1.020*	35.355*	0.049*
0–16 weeks	1.025*	35.529*	0.048*
0–20 weeks	1.030*	35.702*	0.047*
0–24 weeks	1.030*	35.702*	0.047*

𝑃 value compared to baseline (0 weeks), ^∗𝑃 value < 0.05.