When papules have a yellow or white centre containing pus, they are then describes as pustules. “Nodules and cysts are more severe types of acne. They tend to be deep and painful and often ...

Mild forms include blackheads and whiteheads, categorised as mild inflammatory acne. Moderate to severe types involve small, ...

Blackheads and pimples form over the shutdown pores; there may also be pustules, but infection is believed to be the result of the acne, not the cause of it. In severe, persistent cases ...