Our expert says:
Rather ask your pharmacist to make you a mixture of 2% salicylic acid - they have a "recipe book" called Martindales that gives them the exact volumes to be mixed to get the right strength. It may smell better too!
You can use salicylic acid 2% daily lifelong
The salicylic acid will not be absorbed into the body if used in this strength
Ideally the cream should stay on, but if really unpleasant you probably can wash off after a while - may then however be not that effective
See this article: http://www.medicinenet.com/keratosis_pilaris/page3.htm
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