Many people can use salicylic acid regularly, but frequency should follow the individual product's directions, especially if your skin is new to the ingredient or prone to dryness.

With consistent use, some people may notice fewer blackheads and less visible congestion over several weeks, though results vary depending on the skin and routine.

It's generally better suited to oily, combination, or acne-prone skin. If your skin runs dry or sensitive, a gentler cleanser is usually a better starting point, or use salicylic acid only a few times a week rather than daily.

It depends on the rest of your routine and the specific products you're using. Introducing several active ingredients at once can increase the risk of irritation, so it's generally better to introduce one new active at a time and see how your skin responds.