Acne is a disorder that causes outbreaks of skin lesions commonly called pimples. It is caused by the skin's oil glands making too much sebum, an oily substance, which leads to plugged pores. It also can be caused by the rapid production of a bacteria P. acnes. Acne lesions occur mostly on the face, neck, back, chest, and shoulders. It is the most common skin disease. Rosacea is a common but poorly understood disorder of the facial skin that is estimated to affect well over 16 million Americans -- and most of them don't know it. In fact, while rosacea is becoming increasingly widespread as the populous baby boom generation enters the most susceptible ages, a Gallup survey found that 78 percent of Americans have no knowledge of this condition. Psoriasis is a persistent, long-lasting (chronic) disease that is not contagious. While the exact cause of psoriasis is unknown, scientists believe the immune system mistakenly activates a reaction in the skin cells that causes itchy skin spots, patches, and lesions to form. Use a sunscreen with a sun protection factor (SPF) of 30 or higher. Be sure to apply it correctly – studies show that most people don't! A typical adult should use approximately one ounce to cover the entire body and a typical child, half an ounce. Apply it onto dry skin 20 minutes before going outdoors and reapply every two hours. Wear it daily, even on cloudy days. Periodic self-examinations aid in recognition of any new or developing lesion. Become familiar with your skin and your own pattern of moles, freckles and beauty marks. Make sure to look at your entire body every month or two. Watch for change in the number, size, shape and color of pigmented areas. MelaFind is a breakthrough medical device for dermatologists to help detect melanoma at its most curable stage.