brown spots on face pimple

a form of post-inflammatory hyperpigmentation (PIH), caused by the skin producing excess melanin to heal the inflammation from the acne. These spots are different from scars and will fade over time, but factors like sun exposure and picking at the pimple can make them worse. To help them fade faster, avoid picking, use sunscreen, moisturize your skin, and consider gentle skincare products with ingredients like niacinamide or retinoids