Non-inflamed pimples are known as comedones They are more frequent in the younger patients.There are two types of comedones. One is blackheads also known as open comedones , in which the black colour is due to melanin but not dirt.And another is whiteheads also known as closed comedones.
Apart from blackheads and whiteheads ,we often see inflammatory pimples like papules, pustules (5mm or less in diameter), and nodules.
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