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Two doctors in Wuhan who survived coronavirus after long battles on life support found their skin changed colour as a result of their treatment.

Dr Yi Fan and Dr Hu Weifeng were infected with Covid-19 while treating patients at the Wuhan Central Hospital in January.

Battling the virus since their diagnoses on January 18, the skin of the two medics, both 42, has turned dark after a long period of treatment.

The change has been attributed to a hormonal imbalance due to liver damage caused by the virus, according to Chinese state broadcaster CCTV.

Wuhan lifts Coronavirus lockdown - In pictures 15 show all Wuhan lifts Coronavirus lockdown - In pictures 1/15 A medical worker from China's Jilin Province, in red, embraces a colleague from Wuhan as she prepares to return home at Wuhan Tianhe International Airport AP 2/15 A pilot leans out of the cockpit window to wave goodbye before the China Eastern airlines flight, the first domestic flight from Wuhan that resumed service after travel restrictions to leave the capital of Hubei province and China's epicentre of the novel coronavirus disease (COVID-19) outbreak were lifted, takes off from Wuhan Tianhe International Airport to Sanya Reuters 3/15 A medical staff member from Jilin Province tears up during a ceremony before leaving as Tianhe Airport is reopened in Wuhan AFP via Getty Images 4/15 Passengers wearing face masks and suits to protect against the spread of new coronavirus walk past a display screen at Wuhan Tianhe International Airport i AP 5/15 A passenger wearing a face mask is seen in the counter at the Tianhe Airport after it was reopened today AFP via Getty Images 6/15 People wearing protective clothing and masks arrive at Hankou Railway Station in Wuhan AFP via Getty Images 7/15 Travellers wearing protective gear ride an escalator at Wuchang Railway Station before travel restrictions to leave Wuhan Reuters 8/15 Medical staff from Jilin Province (in red) hug nurses from Wuhan after working together during the COVID-19 coronavirus outbreak during a ceremony before leaving as Tianhe Airport is reopened in Wuhan AFP via Getty Images 9/15 Medical workers from China's Jilin Province react as they prepare to return home at Wuhan Tianhe International Airport AP 10/15 A man wearing protective gear gets through security check at Wuchang Railway Station before travel restrictions to leave Wuhan, the capital of Hubei province and China's epicentre of the novel coronavirus disease (COVID-19) outbreak are lifted Reuters 11/15 A woman wearing a face mask to protect against the spread of coronavirus puts a poncho on a child at Wuhan Tianhe International Airport in Wuhan AP 12/15 Bullet trains at a station in preparation for resuming operations after authorities lifted a more than two-month ban on outbound travel, in Wuhan AFP via Getty Images 13/15 People wait for the train at the Hankou Railway Station in Wuhan as travel restrictions for leaving the city, the epicentre of a global coronavirus disease (COVID-19) outbreak, are lifted and people will be allowed to leave the city via road, rail and air Reuters 14/15 A train staff member stands on a high-speed train at Wuhan's Hankou Railway Station Reuters 15/15 People wait for the train at the Hankou Railway Station in Wuhan as travel restrictions for leaving the city, the epicentre of a global coronavirus disease (COVID-19) outbreak, are lifted and people will be allowed to leave the city via road, rail and air Reuters 1/15 A medical worker from China's Jilin Province, in red, embraces a colleague from Wuhan as she prepares to return home at Wuhan Tianhe International Airport AP 2/15 A pilot leans out of the cockpit window to wave goodbye before the China Eastern airlines flight, the first domestic flight from Wuhan that resumed service after travel restrictions to leave the capital of Hubei province and China's epicentre of the novel coronavirus disease (COVID-19) outbreak were lifted, takes off from Wuhan Tianhe International Airport to Sanya Reuters 3/15 A medical staff member from Jilin Province tears up during a ceremony before leaving as Tianhe Airport is reopened in Wuhan AFP via Getty Images 4/15 Passengers wearing face masks and suits to protect against the spread of new coronavirus walk past a display screen at Wuhan Tianhe International Airport i AP 5/15 A passenger wearing a face mask is seen in the counter at the Tianhe Airport after it was reopened today AFP via Getty Images 6/15 People wearing protective clothing and masks arrive at Hankou Railway Station in Wuhan AFP via Getty Images 7/15 Travellers wearing protective gear ride an escalator at Wuchang Railway Station before travel restrictions to leave Wuhan Reuters 8/15 Medical staff from Jilin Province (in red) hug nurses from Wuhan after working together during the COVID-19 coronavirus outbreak during a ceremony before leaving as Tianhe Airport is reopened in Wuhan AFP via Getty Images 9/15 Medical workers from China's Jilin Province react as they prepare to return home at Wuhan Tianhe International Airport AP 10/15 A man wearing protective gear gets through security check at Wuchang Railway Station before travel restrictions to leave Wuhan, the capital of Hubei province and China's epicentre of the novel coronavirus disease (COVID-19) outbreak are lifted Reuters 11/15 A woman wearing a face mask to protect against the spread of coronavirus puts a poncho on a child at Wuhan Tianhe International Airport in Wuhan AP 12/15 Bullet trains at a station in preparation for resuming operations after authorities lifted a more than two-month ban on outbound travel, in Wuhan AFP via Getty Images 13/15 People wait for the train at the Hankou Railway Station in Wuhan as travel restrictions for leaving the city, the epicentre of a global coronavirus disease (COVID-19) outbreak, are lifted and people will be allowed to leave the city via road, rail and air Reuters 14/15 A train staff member stands on a high-speed train at Wuhan's Hankou Railway Station Reuters 15/15 People wait for the train at the Hankou Railway Station in Wuhan as travel restrictions for leaving the city, the epicentre of a global coronavirus disease (COVID-19) outbreak, are lifted and people will be allowed to leave the city via road, rail and air Reuters

Dr Yi, a cardiologist, recovered from the illness after 39 days on a life support machine, while Dr Hu's condition was described as worse and has left him bed-bound for 99 days.

Dr Yi has been moved onto a ward at Wuhan's China-Japan Friendship Hospital but Dr Hu, a urologist, is still being looked after in intensive care.

They were both treated with Extra Corporeal Membrane Oxygenation (ECMO), a piece of equipment which delivers oxygen into the blood.

Dr Hu's doctor, Dr Li Shusheng, suspected their skin turned dark as a result of medication they were given early on in their treatment.

He said one of the drug's side effects is the darkening of the skin colour and said it should return to normal once their livers start functioning properly again.

Dr Yi spoke to broadcaster CCTV from his hospital bed, where he said he had mostly recovered from the infection, but he was struggling to walk independently.

He told a reporter: "When I first gained conscious, especially after I got to know about my condition, I felt scared. I had nightmares often."

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Officials in Wuhan, where the outbreak of Covid-19 originated late last year, recently revised the city's coronavirus death toll from 2,759 to 3,869, increasing the number of fatalities by almost 50 per cent.