DermNet provides Google Translate, a free machine translation service. Note that this may not provide an exact translation in all languages
Author: Dr Amanda Oakley, Dermatologist, Hamilton, New Zealand, July 2014.
Acne is a common chronic disorder affecting the hair follicle and sebaceous gland, in which there is expansion and blockage of the follicle and inflammation. There are several variants.
Acne affects males and females of all races and ethnicities. It is prevalent in adolescents and young adults, with 85% of 16 to 18 year-olds affected. However, it may sometimes occur in children and adults of all ages.
Acne is due to a combination of factors. The exact mechanisms are not fully understood.
Flares of acne can be provoked by:
Acne is often confined to the face but it may involve neck, chest and back.
It is characterised by:
Severity is classified as mild, moderate or severe.
In most cases, tests are unnecessary. If features are atypical consider:
See more images of acne:
Treatment with isotretinoin can lead to long-term remission in many patients.
See the DermNet NZ bookstore
© 2021 DermNet New Zealand Trust.
DermNet NZ does not provide an online consultation service. If you have any concerns with your skin or its treatment, see a dermatologist for advice.