The new review showed that prevalence in 2021 was highest in Germany, where almost 15.98% of teenagers and young adults were diagnosed.

Researchers said rates of acne had been on the rise in all countries, except New Zealand.

“Our research didn’t look at why this is, but it could be linked to lifestyle factors like diet, stress, obesity rates, increased exposure to pollution from urbanisation, or simply a greater likelihood of seeking treatment.

“It is plausible that, as healthcare becomes more accessible in countries, reported acne rates increase. This is unlikely to be the only factor though, as even in countries with good access to healthcare, cases have increased.