Is this the correct way of applying AHA and BHA?

I am making 8% lactic acid and 2% salicylic acid products with pH 3.8 for each. Package is PET bottle with flip top cap. Currently for samples the using method is we put a few drops on palm of one hand and then by finger of another hand apply that to face. 

Is this method of using correct that should be written on label too? 
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