I have been using a small amount of this product once a week around my nose and chin to clear blocked pores. I've only been using it this way for a few weeks. However, as soon as I wash it off I get a burning/tingling feeling, but no redness or itching. This feeling usually lasts about 30 mins or so. I don't keep the scrub on my skin longer than a few seconds. Is this burning/tingling feeling normal with this product? Thanks!