4-n-Butylresorcinol ek resorcinol derivative hai jo skin ke dark spots aur hyperpigmentation ko kam karne ke liye use hota hai. Ye tyrosinase aur tyrosinase-related protein-1 enzymes ko block karta hai jo melanin banate hain. Isse melasma aur uneven skin tone theek hota hai. Usually isse AM aur PM dono time apply kar sakte ho. Dark spots wale areas par lagao regular use se achhe results milte hain.