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Why is this woman’s skin yellow?



 

The patient

A 25 year old lady brought up a ‘while I’m here, doctor’ as she attended for her contraceptive pill check. She had noticed a yellowing of the skin of her hands and wanted to be sure this wasn’t a side effect of her pill – she had read on the patient leaflet that skin discolouration could sometimes be a pill-related issue.

The problem had been present for a few months. She was otherwise well with no weight loss or, abdominal symptoms, and she’d noticed no colour change in her urine or motions. Apart from her pill, she was on no other medication She was a non smoker and there was no other relevant medical history.

First instinct.

A cursory glance revealed a yellowy orange stain-like discolouration to the palms of her hands. No similar abnormality was apparent elsewhere – in particular, her sclera had no hint of yellow, even allowing for the less than ideal surgery lighting.

It’s always tempting to be dismissive of a symptom presented ‘en passant’, and I was inclined to write this off as simply staining from some outside source – though her job, a bank clerk, provided no obvious clue and she remained adamant that there must be some other cause.

Differential diagnosis

  • Staining from external source
  • Chloasma
  • Jaundice
  • Carotenaemia

In the absence of an obvious culprit, we agreed to put the possibility of skin staining from some dye or chemical to one side.

I guessed that the skin colouration referred to in the pill patient leaflet was chloasma. This is common, but normally results in a brownish skin staining, invariably on the face – I’ve certainly never encountered it on the hands.

Jaundice is a common worry in patients whose skin seems to be going yellow or orange – though it wasn’t this patient’s concern. Besides, the clear sclera ruled this out.

This left carotenamia – discolouration caused by excessive consumption of carotene, found in yellow and green vegetables, and citrus fruits.

The hidden clue

The distribution is an important prompt. And, having pushed carotenaemia to the top of the diagnostic possibility list, this cued me to ask her about her diet – which was when she mentioned she was a strict vegetarian.

Getting on the right track

Further exploration of her dietary habits revealed she had a huge intake not of carrots – the usual explanation in carotenaemia – but of mangoes and orange juice. Both of these are very high in carotene. She wasn’t immediately convinced, finding my new explanation of her symptoms about as convincing as my original theory that she simply had stained hands.

But she agreed to reduce her intake of carotene-rich foods. And, when she returned six months later for her next pill check, I was gratified to see that her palms were back to their original pink colour.

 

Dr Keith Hopcroft is a GP in Laindon, Essex

Why is this woman’s skin yellow? Why is this woman’s skin yellow?