Acne, what we call pimples, can be a painful and socially embarrassing skin situation. Comedones are the key feature of acne. Comedones are usually known as blackheads (open comedones) and whiteheads (closed comedones). Pustules, nodules and cysts can also happen and these can lead to scarring. While acne happens mostly in teenagers, it can also happen in infants, adults and sometimes even the elderly. The most common type of acne suffered by teenagers and young adults is called acne vulgaris. In most patients, acne vulgaris generally resolves without treatment by the time people hit their late 20s or early 30s. However, acne can often lead to scarring which can be difficult and costly to treat. If you notice scarring develop on your skin as a result of acne, see your dermatologist as soon as possible to receive appropriate treatment. Acne treatments offered will vary depending on numerous factors, which is why it is essential that your skin to be assessed in context of your medical history and skin type.