A red lesion which appeared in the roof of a man’s mouth was caused by performing too much fellatio, doctors have claimed.
Dentists in Mexico stumbled across the mystery circular mark when the 47-year-old patient went for a routine check-up.
Flummoxed by the mark, the dentist at the School of Dentistry at the Universidad de Montemorelos proceeded to question the patient about its cause.
The medic then agreed that the red skin, known as erythema, was likely to have been caused by the patient performing too much oral sex.
Upon questioning, the man revealed he is sexually active with men and regularly performs oral sex, with the last occasion taking place just three days before his dental visit.
However the mark was symptomless and the patient was completely unaware of its existence prior to his dental visit.
Medical professionals wrote about the case in a prestigious medical journal and warned other dentists to be on the lookout for such marks.
Writing in the BMJ Case Reports, they explained how the red lesion appeared.
The dentists wrote: "The contact of the palate with the penile glands may cause a haematoma due to blunt trauma.
"We concluded the erythema on the soft palate was associated with the practice of oral sex."
They told the patient the lesion would dissipate on its own and the mark had significantly faded just a week later.
However if it hadn’t cleared up, dentists may have been required to perform a biopsy as such lesions can sometimes be an indication of oral tumours.
Writing in the journal, Dr Mendez and colleagues added that other causes of such lesions can include playing a wind instrument.
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