Change in lesion counts ‐ non‐inflamed (counts or %)
Study	Time points	Salicylic acid	Topical treatments (comparator)	P value
parallel trials
Babayeva 2011	Percent reduction ‐ long term	81.5%	87.2%	P value was not reported. Quote: "...these differences were not statistically significant..."
split‐face trials
Bae 2013	Average number reduction of non‐inflamed ‐ medium term	8	4.3	0.04
Levesque 2011	Percent reduction ‐ long term: 12 weeks after start of treatment	48.5%	55.6% (lipohydroxyacid peels)	0.878