Health Articles | March 27, 2007 When you think of acne, spots and pimples often come to mind, and you automatically assume that acne is simply acne, and that it comes in only one form. However, you may be surprised to find out that there is actually more than one type of acne. In fact, there are quite a few! So how can you tell the various forms apart, and how do you know which kind you actually have? The Different Types of Acne Even though pimples are the most common form of acne, there are other forms too, and they are generally separated into groups which are non inflammatory acne and inflammatory acne. Non Inflammatory Acne:Non inflammatory acne generally comes in two forms. Either closed comedo/whitehead or open comedo/blackhead. An open comedo/whitehead usually occurs when the blocked follicle stays underneath the skin. The lesion is called a closed comedo or a whitehead and they usually appear just under the skin as small, white bumps. A closed comedo/blackhead occurs when the ...