Melasma, sunspots, and post-inflammatory hyperpigmentation (PIH) are all types of hyperpigmentation, but they differ significantly in causes, appearance, and behavior. Melasma is typically triggered by hormonal changes—such as pregnancy or birth control use—and often worsens with sun exposure. It presents as symmetrical, blotchy patches, commonly on the cheeks, forehead, upper lip, and chin. Unlike other forms of pigmentation, melasma is notoriously resistant to treatment and tends to recur without diligent sun protection and long-term skincare maintenance.
Sunspots, also known as solar lentigines or age spots, are caused by cumulative UV damage over time. They appear as flat, well-defined brown spots, often on sun-exposed areas like the face, hands, chest, and shoulders. These spots are more common in older adults and are generally easier to treat than melasma. Post-inflammatory hyperpigmentation, on the other hand, occurs after skin trauma or inflammation—such as acne, eczema, or a cosmetic procedure. PIH shows up as flat discoloration in the affected area and is more prevalent in individuals with medium to dark skin tones. While PIH can fade over time with proper care, treatment approaches differ based on the underlying cause, depth of pigment, and individual skin type.