Lemon is a small citrus fruit, like a small orange, with skin and flesh that are green in color. 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. Benefits. 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, while it also benefits hair and skin care. How to use. Lemons are a mainstay of several food preparations, and its juice is used as a flavoring agent, to add sour taste to salads, soups, vegetable, meat & fish preparations etc.