In the UK, nutritional deficiencies are usually only considered as a factor underpinning angular chelitis if other treatments seem to have not worked. Blood samples are taken and tested for glucose (as diabetes can compromise the immune system), iron, folic acid and vitamin B12. Correcting a deficiency is usually enough to prevent the problem recurring in the future.

This is also a good opportunity to provide some advice on basic lip care. Products containing petroleum jelly or beeswax are good choices for those who suffer from dry or sore lips, as they act as a barrier to trap moisture and protect against infection. Stick products are better than pots as they don’t require fingers to be used for application and therefore there is a reduced chance of microorganisms being introduced. Individuals who spend a lot of time outside should seek out a product with a sun protection factor of at least 15. And licking lips should be discouraged, as it removes the skin’s natural oils, exacerbating the issue.