Your skin contains oil glands also known as the sebaceous glands and it produces sebum. Sebum is simply oil and this helps to moisturize your skin, hair for instance. Most of the time, your skin will produce sebum in reasonable amount but sometimes, excess oil is produced resulting in clogged pores and this can lead to acne which can be in the form of papules, pimples, whiteheads, blackheads, nodules and cysts.

Papules - These are tender red bumps which are inflamed without any head.

Pimples or Pustules - When the walls of your pores are broken, this can result in bacteria, dead skin cells and sebum to get underneath your skin and this can cause pimples or pustules which are small red infections.

Whiteheads - When your pores are clogged with oil and they stay closed, whiteheads can bulge out of your skin.

Blackheads - When your pores are clogged with oil and they stay opened, this can leave a dark spot at the top surface resulting in a blackhead.

Nodules - These are larger acne spots which appear as hard bumps under your skin. Squeezing them is not recommended as you will just irritate your skin and might cause inflammation.

Cysts - Cysts are one of the worst forms of acne. Similar to nodules but filled with pus. When your pores are clogged and opened deep inside your skin, this can lead to a more serious infection and can create cysts.

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