Acne is one of the world's most common skin conditions. Most people, at some point in their lifetime, are affected by acne. Generally, acne develops on the face and appears as spots (as shown in the following diagram) and oily skin. Sometimes, the skin can become hot or painful to the touch. Acne can manifest as whiteheads, blackheads, pustules, papules, cysts, and nodules. The first three are also known as pimples. Different types of acne need different treatments and care; therefore, detection and automated classification of acne could be useful. Acne can be confused with one of three similar conditions—rosacea, eczema, or allergic reaction—because patients often self-diagnose and treat. Incorrect diagnosis and treatment can make the condition worse. The following diagram shows two examples of what acne...
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