Heliotherapy is a treatment method that uses sunlight or artificial light to improve health. It is often used to help with conditions like psoriasis, eczema, and certain types of depression. The exposure to ultraviolet (UV) light can promote healing and enhance mood by increasing the body's production of vitamin D. This therapy can be administered in various ways, including direct sunlight exposure or through specialized lamps that emit UV light. While heliotherapy can be beneficial, it is important to use it safely to avoid skin damage and other potential risks associated with excessive sun exposure.