Acne Vulgaris is yet another term referring to common acne. This kind of acne is typically for adolescents. Nevertheless, it is possible that acne persists and become more severe reaching adulthood.
There are two main types of acne vulgaris: non-inflammatory acne (also called comedones) and inflammatory acne.
Whitehead is closed non-inflammatory type of acne also known as closed comedones. When a skin pore is entirely clogged with sebum, bacteria mixed with dead skin cells, the result is appearance of white raised spot that looks like bubble. Whitehead lasts shorter period of time compared with blackhead.
Blackhead is open non-inflammatory type of acne also known as opened comedones. When a skin pore is only partially clogged with sebum, bacteria mixed with dead skin cells, as a result it allows the clogged material to drain to the surface. The dark color is a reaction of the skin pigment called melanin when it reacts with oxygen in atmosphere. Blackhead has a stronger structure and it takes longer period of time to clear it.
A papule is small solid structured pink lesion (about 5 mm or less) slightly raised above the skin surface. It appears when a follicular wall breaks then the skin pore gets filled up with white blood cells what causes inflammation. It contains no pus but rash, itching and even pain are usually present.
A pustule is actually papule formed after a few days later, very similar to a whitehead. However, in comparison to the papule, it shows up as a red circle along with a white or yellow pus. Pustule is often called a zit or a pimple.
Nodule is a severe type of acne vulgaris. It`s a large, hard structured and often quite painful bump that appears deep within the skin and usually lasts for a few months. It appears when follicular wall breaks around the lower part allowing the sebum, bacteria or dead skin cells to block it. That leads to a big inflamed bump. Scarring is also very common along with this type of acne.
Cyst is another type of severe acne vulgaris often very similar to a nodule, but unlike the nodule it is filled with pus. This is a very painful type of acne and can reach size up to 2 inches or even more. Once again, scarring is very common.