Azelaic acid is effective for freckles.
Azelaic acid, also known as azelaic acid, is a natural antioxidant with anti-inflammatory, antikeratinizing, depigmenting, and antioxidant properties, and is often used to treat acne and hyperpigmentation, and has been shown to be effective for melasma and freckles.
Because it metabolizes dark particles in the skin, inhibits tyrosinase in melanocytes, and reduces melanin synthesis, it is used to treat acanthosis nigricans, small malignant moles, and melanoma. Azelaic acid has an inhibitory and therapeutic effect on melanocytes in the surface layer, but if melasma or freckles reach the dermis, the therapeutic effect will be weakened.
Due to the natural properties of azelaic acid, it can be used for a long period of time without drug resistance. Azelaic acid has less side effects in clinic, there are very few will have irritation, redness, swelling and other manifestations, can be appropriate to reduce the use of drugs and stop the drug.