2. Glycolic Acid (Alpha Hydroxy Acid)
These can be useful in the war on acne, but AHAs tend to be better for sun-damaged skin rather than blemish-prone skin. But if a BHA isn't working for you, this could be an option because it does increase the cell turnover rate. Glycolic acid is available in numerous drugstore products in non-prescription strengths of 4% to 10%. For maximum efficacy, your choice should have a pH of under 4. I would be very wary of using a product that contains more than a 10% concentration of AHA without the supervision of a doctor because it could cause far more damage than good (read: irritation or even scarring). There are a plethora of good AHA products on the market, from Pond's to Neutrogena's Healthy Skin. Just make sure you don't use the ones with sunscreen because they almost never contain adequate UVA protecting ingredients.
Some initial redness and tingling is quite common when you first start to use an AHA or BHA product. However, if the product irritates your skin, discontinue use *immediately*. Irritation is bad for anyone's skin, but aggravated acne is certainly not a pretty sight. If you have sensitive skin, start with a fairly low concentration and work up as your skin builds tolerance.
N.B. Use of either AHA or BHA products will make your skin more sensitive to the sun, which means you absolutely must wear sunscreen. But you knew that, right?
5 พ.ย. 45 07:42:15