I did a 20% Salicylic acid peel Friday night, Saturday morning, Monday night and Tuesday night. The first time I left it on for 2 minutes, then 5-10 minutes, then 20-30 minutes, then 1-2 hours. The last time the peel did leave my skin a little red, but that went away by morning. My face is completely clear except for 1 tiny pimple near my eye. Everything you see are red marks.