Identify one reason for nail discoloration.

Nail discoloration can often occur due to the use of certain nail polishes or chemicals. Many nail products contain pigments and chemicals that can stain the natural nail plate, leading to a yellow, green, or even blue appearance. Certain ingredients in nail products, particularly those with intense colors or lower-quality formulations, can penetrate the nail and cause discoloration over time. Additionally, prolonged exposure to chemicals such as those found in nail removers or sanitizers can contribute to this issue, further highlighting the importance of choosing high-quality products and practicing proper nail care to maintain natural nail health.