Search our A to Z of Skin to find out more about common skin conditions and problems, their symptoms, causes and how they are diagnosed and treated. You can search by both common and medical names, or by medicine or treatment name.

Both common and medical names have been included to help your search, as well as the names of medications and treatments. There are also a number of cosmetic topics which explain the latest treatments for cosmetic concerns related to the skin. Many College dermatologists have contributed to the information on this site.

The process has been overseen by a committee of dermatologists to ensure that the final versions are both accurate and user friendly. Particular thanks go to Dr Pam Brown, Dr Peter Berger, Dr Davin Lim, Dr Michelle Rodrigues, Dr Yin Vun, Conjoint Associate Prof Orli Wargon and Dr Eleni Yiasemides (Chair). The A to Z information is regularly updated. Please check back on a regular basis for updates and the addition of new topics.

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  • Raynaud phenomenon

    Raynaud phenomenon is an intermittent constriction of the blood flow to the fingers and toes precipitated by cold, emotion and some drugs that cause spasm of the small arteries bringing blood to the fingers and toes.

  • Razor bumps

    Razor Bumps also known as Pseudofolliculitis barbae is a chronic inflammation of hair-bearing areas of the skin caused by ingrown hairs that develop after shaving or plucking

  • Rebound sweating

    Rebound sweating also known as compensatory hyperhidrosis, is a common post-surgical complication of endoscopic thoracic sympathectomy (ETS surgery).

  • Recurrent aphthous stomatitis (RAS)

    Recurrent aphthous stomatitis (RAS) also known as Aphthous ulcers, are a common problem with a higher prevalence in high socio-economic areas.

  • Recurrent jaundice or recurrent cholestasis of pregnancy

    Recurrent jaundice or recurrent cholestasis of pregnancy also known as Intrahepatic cholestasis of pregnancy, is a rare liver condition which causes an itchy skin. There is no rash but the skin may show scratch marks (excoriations) or become yellow (jaundiced).

  • Red stretch marks

    Stretch marks are extremely common, affecting over 70% of the population. There are two types of stretch marks - striae rubra (red or new stretch marks) and striae alba (white or old stretch marks). New stretch marks are more responsive to treatment than old stretch marks.

  • Retinoids

    Retinoids are a group of medications related to vitamin A.

  • Rhinophyma

    Rhinophyma is the slow thickening of the nasal skin. It affects adults and is more common in men than in women.

  • Ringworm of the scalp

    Ringworm of the scalp also known as tinea capitis, is a fungal infection of the scalp and hair. It most commonly affects children between three to seven years of age but adults can also be affected.

  • Rodent ulcer

    A rodent ulcer also known as Basal cell carcinoma (BCC) is the most common type of skin cancer. Fortunately it is also the least dangerous and almost always completely cured by treatment.

  • Rosacea

    Rosacea is a common, chronic skin disorder affecting the central face. It is an episodic and variable condition but classically presents as acne-like bumps (papules and pustules), red or pink patches and broken capillaries.

  • Roseola Infantum