The skin is the body’s largest organ. As the first layer of defense, it is responsible for protecting the body and the internal organs. Skin problems vary in severity from a mild annoyance to possible warning signs of more serious conditions. There are hundreds of skin conditions, which often have similar signs and symptoms and are sometimes difficult to distinguish. Skin conditions may be acute and chronic and affect people of all ages and backgrounds. Some of the most commonly seen skin conditions include acne, dermatitis, rosacea, hives, eczema, and psoriasis.