AZELAIC ACID

Azelaic acid is a naturally occurring C9 saturated dicarboxylic acid (nonanedioic acid) found endogenously in human skin and present in cereal grains, where it is produced by the yeast Malassezia furfur. Unlike many brightening actives that rely solely on tyrosinase inhibition, azelaic acid is uniquely selective — it preferentially targets hyperactive and abnormal melanocytes while leaving normally functioning melanocytes largely unaffected, making it particularly well-suited for addressing post-inflammatory hyperpigmentation in deeper Fitzpatrick phototypes without risk of paradoxical depigmentation. Formulators favor it for its dual-action profile combining melanocyte normalization with clinically documented anti-inflammatory and mild keratolytic activity, and its established tolerability in sensitive and acne-prone skin, though its low aqueous solubility at room temperature (approximately 2.4 g/100 mL at 20°C) demands careful thermal dispersion technique in formulation.