Post-inflammatory hyperpigmentation, or PIH, is a common skin condition that develops due to inflammation or injury. It can be caused by scrapes, burns, cuts, or skin conditions like acne or atopic dermatitis. Once the injury or inflammation heals, dark marks or spots can take their place and make the skin look purple, brown, gray, or black. PIH typically fades over time and can eventually disappear altogether. However, this process can take months to years to fully resolve. If you want to lighten hyperpigmented skin more quickly, topical creams, laser treatments, and chemical peels can help. Additionally, taking proper preventative measures like sun protection and skincare can reduce your risk of developing PIH.