4-tert-Butyl-resorcinol is widely used in the cosmetic and dermatological industries due to its skin-lightening and depigmenting properties. It is a key ingredient in formulations designed to treat hyperpigmentation, such as age spots, melasma, and post-inflammatory hyperpigmentation. The compound works by inhibiting tyrosinase, an enzyme crucial for melanin production, thereby reducing skin discoloration and promoting a more even skin tone. Additionally, it is incorporated into anti-aging products for its antioxidant properties, which help protect the skin from oxidative stress and environmental damage. Its efficacy and safety profile make it a popular choice in over-the-counter and prescription skincare products.