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He described worrying about what he ate aged 15-16 - and by the time The Vamps started, he decided to have surplus natural breast tissue in his chest, a condition called gynaecomastia, removed.

A growing number of reported cases of male gynaecomastia have coincided with topical exposure to the oils.

"At present, there is insufficient evidence to support the concept that exposure to lavender and tea tree oil containing products cause gynaecomastia in children, and further epidemiological and experimental studies are required."

Gynaecomastia is rare, and there is often no obvious cause.

Dr Rod Mitchell, honorary consultant paediatric endocrinologist at the Queens Medical Research Institute in Edinburgh said the study "is important in establishing a possible mechanism for the suggested link between gynaecomastia and exposure to lavender and tea tree oils".