Question: how often should i use salicylic acid?
Answer: For acne: Adults—Use the 0.5 to 2% topical solution one to three times a day. ... 
For common warts and plantar warts: Adults—Use the 5 to 27% topical solution one or two times a day. ... 
For corns and calluses: Adults—Use the 12 to 27% topical solution one or two times a day.