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February 2017.

Comedo — codes and concepts

What is a comedo?

A comedo (plural comedones) is a plugged follicular orifice.

  • Open comedones (blackheads) are grey, orange, brown or black papules. The keratinous contents can be expressed or extracted. 
  • Closed comedones (whiteheads) are uninflamed skin-coloured papules. They must be punctured to remove their contents.

Which conditions are characterised by a comedo?

Skin lesions and conditions in which there are prominent comedones include:


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