Acne is a common condition that causes blocked pores, pimples, cysts and other lesions on the skin. While it is most common in teenagers, acne can affect people of all ages, most often appearing on the face, neck, chest, back, shoulders and upper arms.
Long term and repeated exposure to sunlight, especially ultraviolet light, can cause a variety of cosmetic and medical problems related to the skin, commonly referred to as sun damage. Sun damage can affect any area of the skin as a result of excessive exposure to the ultraviolet (UV) rays of the sun. Sun damage most commonly occurs on the face, hands and arms, and may lead to sun spots, age spots, rough skin and wrinkles. Years of sun exposure can also lead to premature aging and skin cancer. Some individuals may notice skin lesions that are a form of actinic keratosis, which is is a precancerous skin condition that develops from years of sun exposure.