Acne

Also called Acne vulgaris or Spots

Acne is a common skin condition in which hair follicles become blocked with oil and dead skin, leading to blackheads, whiteheads and inflamed spots. It is most common in teenagers but can start or continue in adulthood. Many effective treatments exist, and treating it early can help prevent scarring.

Last updated Nov 9, 2026

What it is

Hormone changes, especially during puberty, periods and pregnancy, make the skin produce more oil. Family history plays a part, and some medicines and cosmetics can make it worse.

Mild acne is often treated with creams or gels. Moderate or severe acne may need tablets prescribed by a doctor or dermatologist, and these usually take several weeks to work.

Common signs

  • Blackheads and whiteheads
  • Red, inflamed spots and pus-filled spots
  • Deeper painful lumps (nodules and cysts)
  • Marks or scars left after spots heal

How it is usually diagnosed

  • Recognised by looking at the skin; tests are rarely needed
  • Sometimes hormone blood tests, for example if periods are irregular
  • Blood tests before and during some prescription tablets

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • A list of treatments tried, with dates and how well they worked
  • Dermatology letters and prescriptions
  • Blood test results taken while on treatment
  • Dated photos of your skin, to judge progress

Questions to ask your doctor

  • How long should I try this treatment before deciding if it works?
  • Which side effects should I watch for?
  • Are blood tests needed with this medicine?
  • What can be done about scarring?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Swelling of the face, lips or throat or difficulty breathing after starting a new medicine
  • Thoughts of harming yourself; speak to someone the same day

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

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