I have sensitive skin - is this Azelaic Acid 15% w/w Gel safe and effective for dark spots, pigmentation and blackheads?

Azelaic acid 15% gel is widely used for dark spots, post-acne pigmentation and blackheads (it helps keep pores clear), and it is generally well tolerated on sensitive skin, though mild stinging, itching or dryness in the first weeks is common. With sensitive skin it helps to start with a thin layer once a day or every other day and build up as your skin settles, and to use sunscreen in the daytime. Results take several weeks to a few months, and if irritation persists or your skin worsens, please stop and check with a dermatologist.