No, any tanning may be harmful. Long-term exposure to ultraviolet (UV) radiation is known to cause skin cancer, including malignant melanoma. Both tanning beds and natural sunlight expose you to UV radiation. The only safe way to darken your skin is with the use of spray on tans or sunless tanners that are applied at home. It is important to know that darkening of your skin with these products does not protect you from sunburn. If you have had significant sun exposure, blistering sunburns, or have used tanning beds please see your dermatologist for a skin exam.