His sweat is green

Doctors in China admit that they were particularly troubled by the case of a man's sweat is green!
Mr. Cheng Shunguo, the city Wuhan, says that his sweat "got" green around
In mid-November.
"I noticed that my underwear and sheets of the bed had been green, even the water in the shower was green," said 52-year-old man.
This man said he did not feel anything special, but visited the hospital to appreciate the special strange sweat!
The doctors cleaned his armpits but in ten minutes the sweat made ​​the green cloth had been placed there!
Submitted to the various blood tests but all results came out negative.
"We can not discover the cause but will keep looking," admitted spokesman for the hospital