Idiopathic guttate hypomelanosis

Dr Christophe HSU – dermatologist. Geneva, Switzerland

What is idiopathic guttate hypomelanosis (IGH)  ?

• These are discrete porcelain-white spots measuring about 5mm in diameter.
• The lesions are localized on sun-exposed areas, more often on the forearms and shins.
• These spots are stable and do not tend to grow.
• Hairs located on the lesions are unaffected.
• No treatment is needed. Foe cosmetic concerns, cryotherapy is sometimes tried as well as creams containing calcineurin inhibitors.

  

  Idiopathic Guttate Hypomelanosis (IGH)

How to distinguish between IGH and vitiligo ?

• Vitiligo is also distributed symmetrically.
• Lesions of vitiligo are chalk-coloured and have an irregular border.
• Spots of vitiligo have a tendency to grow.
• Hairs located on the lesions are also affected and appear white.

Contributors:

Dr Christophe HSU – dermatologist. Geneva, Switzerland

National Skin Centre. Singapore

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