Lemon is a small citrus fruit, which is good for skin. They have an enjoyable aroma, which is generally referred to as a lemony aroma. Its outer skin is bright yellow in color and includes necessary oil that is mostly limonene. The health benefits of lemon include its use as a treatment of throat infections, indigestion, constipation, dental problems, and fever, internal bleeding, rheumatism, burns, obesity, respiratory disorders, cholera and high blood pressure.