They become ruptured oil glands walled off by the skin. The primary reason for treating acne is to prevent scarring. As the redness due to facial blemishes improves, the blemishes turn a lighter purplish color as healing begins. Most blemishes will fade with time. Cosmetics wearers should use only water-based foundation and powder blush.
Generic medications produce unpredictable and inconsistent results.
Sun exposure can actually make acne worse, and may be a cause of skin cancer later in life. A false notion is that acne is an infection. Acne cannot be transmitted to others. It is not an allergy and, despite common thinking, foods have little or no effect on it. Rosacea is a rash commonly confused with acne.