The quickest way to treat blemishes and dullness is to choose care based on the "cause." Even though blemishes and dullness may look similar, their underlying causes are different. Continuing with skincare that doesn't address the cause may not yield satisfactory results. Let's start by clarifying the most common types. Increased melanin production due to ultraviolet radiation (such as age spots) Post-inflammatory hyperpigmentation (acne, friction, post-treatment, etc.) Melas