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Blackheads, whiteheads, and red spots.
Spelt also as "Comedones"
There are two basic types of Acne; non-inflammatory acne and inflammatory acne.

Non-Inflammatory Acne

Noninflamed lesions called comedomes, consist of two types of acne:

1. Closed Comedones, or whiteheads, with no visible opening.
2. Open Comedones, or black heads with visible, dilated openings that are discolored as exposed fatty acids are discolored by air.

ยปยป See forms of non-inflammatory acne treatment here.

Inflammatory Acne

Inflamed lesions result when the follicular wall ruptures to produce up to three types of acne:

1. Papules: the mildest form of inflammatory acne this lesion appears as a small and firm lump in the skin. This is often quite tender but unless there are many, rarely obviously visible.
2. Pustule: like papules, pustules are small and round, however, pus is visible.
3. Nodule: otherwise known as cystic lesions, this is the most serious form of acne and is the result of comedone pollutants spilling into surrounding tissue. The body reacts to this by producing pus to halt the spread of infection. This type of acne may cause scarring if left untreated. Medical treatment is advised.
by Joyce Hayward March 28, 2008
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