Canadian pop singer Justin Bieber has revealed he has been diagnosed with Lyme disease.

Axar.az informs citing foreign media.

"It's been a rough couple years," the 25-year-old wrote on Instagram, adding that he was also suffering from a chronic viral infection.

The star said he was aware of social media speculation that he had a drug problem, after he was pictured looking unwell with blotches on his skin.

Lyme disease is caused by bacteria carried by some species of ticks.

Symptoms of the infection often include a rash, muscle pain, and tiredness.