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. Our thanks go to the many College dermatologists have contributed to the information on this site.

The information provided in the A-Z of Skin is a general guide only and does not replace individual medical advice. Please speak to your doctor for advice about your situation. The ACD is not liable for any consequences arising from relying on this information.

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  • Ichthyosis

    Ichthyosis is a non-hereditary skin condition characterised by dry and rough skin with scaling. It is often described as “fish scale skin” and usually appears for the first time in early adult life.

  • Icterus gravidarum

    Icterus gravidarum 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).

  • Idiopathic jaundice of pregnancy

    Idiopathic jaundice 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).

  • Impetigo

    Impetigo is an infection of the skin that can be passed from person to person. It can affect skin that is intact (known as primary impetigo) or skin that is already compromised with cuts, abrasions, insect bites or other skin conditions such as eczema (known as secondary impetigo or impetiginisation)

  • Incobotulinumtoxin A

    Neurotoxins are a group of substances that are used in dermatology to treat hyperhidrosis (excessive sweating). They are also used to reduce wrinkles, most commonly those around the eyes and on the forehead

  • Infantile Haemangiomas

    Infantile haemangiomas are the most common benign growths of infancy and childhood, affecting 2.6­ to 4% of babies by 6 weeks of age.

  • Infundibular cyst

    An Infundibular cyst also known as an epidermoid cyst, is a benign walled-off cavity filled with keratin which originates from the hair follicle unit.

  • Insect Bite Reactions

    Insect bites can cause reactions in the skin and may transmit diseases. Mosquitoes, flies, ticks and fleas are the main cause of bites and stings.

  • Insect bite-induced hypersensitivity

    Insect bite-induced hypersensitivity also known as papular urticaria, is a term used to describe hypersensitivity or an allergic reaction to insect bites manifested by recurrent and persistent itchy lumps or fluid filled blisters.

  • Intra-Epidermal Squamous Cell Carcinoma

    Intra-epidermal Squamous cell carcinoma also known as Bowen’s disease is a common superficial cancer of the skin. It appears most commonly as a slow-growing, persistent red scaly patch on areas of skin exposed to the sun.

  • Intrahepatic Cholestasis of Pregnancy

    Also known as ... Recurrent Cholestasis of Pregnancy, Obstetric Cholestasis, Cholestasis of Pregnancy, Recurrent Jaundice of Pregnancy, Cholestatic Jaundice of Pregnancy, Idiopathic Jaundice of Pregnancy, Prurigo gravidarum, Icterus Gravidarum What is it? 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). This condition typically develops late in pregnancy and resolves within days after the baby is born. Closer monitoring of the pregnancy is recommended as this condition can have serious effects on the unborn baby.

  • Intralesional Steroids

    Intralesional steroids are injected under the surface of the skin by the treating doctor. They include triamcinolone acetonide and betamethasone acetate. This treatment is chosen when the main problem is deeper in the skin or when the top layer of the skin is very thickened, preventing penetration of creams and ointments. It allows a strong treatment to be delivered just to the area where it is needed with minimal effects on the rest of the body.

  • Irritant Contact Dermatitis (ICD)

    Dermatitis is a very common, itchy red skin rash with a variety of types and causes (some types are also called eczema). It is common for a person with dermatitis to have more than one type, either at the same time or at different times in their lives.

  • Isotretinoin

    Isotretinoin is a medication used to treat severe acne that has not responded to other treatments and is scarring or impacting on a person’s wellbeing. Isotretinoin is one of a group of drugs called retinoids which are related to vitamin A.