AHAs are water-soluble, while BHA is lipid-soluble. This unique property of BHA allows it to penetrate the oil in the pores and exfoliate accumulated skin cells inside the pores' follicle lining that can clog them. BHA is best used where blackheads and blemishes are the issue, and AHAs are best for sun-damaged, thickened, dry skin where breakouts are not a problem.
Using a well-formulated AHA or BHA product is preferred to routine use of a typical scrub. Because AHAs and BHA can perpetrate the superficial layers of skin and produce better results than cosmetic scrubs, which work only on the very outermost exposed surface of the skin.
I have had tingling and slight stinging sensation when using such products but my dermatologist at that time assured me that it's normal, considering I have sensitive skin too. I developed redness on my face as well, but it toned down after a day or two. Because of my sensitivity, I only use it twice a week when I stayed with that dermatologist. When I switched doctors, I stopped using AHA or BHA products since the new doctors never prescribed me with one. I didn't think much about it at first, and since I have already decided the change, just accept the new procedures by the new doctor. But now that I'm not going to any doctor, and realising that BHA products are good for acne-prone skin, I'm tempted to give it another try. Such products have to be used regularly for it to be effective in the long run. Though lots of experimenting would be required of me now (due to my sensitive skin), but that's to better looking skin! Rather start early:)
P.S I'm interested in the BHA gel from Paula's choice but I couldn't find Singapore on their list of shipping countries. I hope they reply my email soon...
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