Why does it sting when you get lemon juice in a cut?

When you get lemon juice in a cut, it stings because of the citric acid present in the juice. Citric acid is a weak acid that can cause irritation and inflammation when it comes into contact with open wounds. The stinging sensation is caused by the acid activating the pain receptors in the skin, sending a signal to the brain that the area is damaged and needs attention.

Additionally, lemon juice contains a compound called psoralen, which is known to increase the skin's sensitivity to ultraviolet (UV) light. When exposed to sunlight after getting lemon juice in a cut, the psoralen can react with the UV rays and cause a more severe sunburn or skin irritation.

To minimize the discomfort and potential complications, it's important to rinse the affected area with clean water immediately if you get lemon juice in a cut. Avoid exposing the cut to direct sunlight and seek medical attention if the cut is deep or shows signs of infection.