WHAT CAN I DO ABOUT... preventing cold sores

This tricky virus is more likely to flare up during the colder months.

“Avoid hot drinks, as heat can irritate the skin and cause inflammation, which can in turn activate the dormant cold-sore virus,” says consultant dermatologist Dr Eva Melegh. Nuts can also encourage cold sores to form. The cold-sore virus requires an amino acid called arginine to replicate.

“Depriving the virus of arginine can help reduce the duration and severity of a cold sores – and nuts and seeds are one of the richest sources of arginine.”

Prevent your lips from becoming dry and chapped by wearing lip balm. LipQ Liquorice Balm (£9.50, skinshop.co.uk) contains liquorice which can help protect lips from cold sores, according to a study carried out by the Herpes Viruses Association.

“Be sure to get plenty of sleep as a lowered immune system also increases the risk of cold sores,” adds Dr Melegh.