Acne marks, often a result of past acne breakouts, can manifest as changes in skin color or texture. Post-inflammatory hyperpigmentation (PIH) and post-inflammatory erythema (PIE) are the two main types of acne marks. To effectively address these, consider incorporating ingredients like azelaic acid, niacinamide, vitamin C, retinoids, and hydroquinone into your skincare routine. These ingredients can help reduce discoloration, improve skin texture, and boost overall complexion.