Academic experts in autism believe the "Piano Man" - the unidentified man found wandering on the Isle of Sheppey in April - may be an autistic savant.
The mystery man - named Piano Man after he drew a detailed picture of a piano and displayed virtuoso skills when health workers gave him the chance to play one - has not spoken since he was found.
He is said to be fearful of being approached and refuses to wear anything but the dinner suit he was found in. All the labels have been removed from his clothing.
Lorna Wing, a retired psychiatrist specialising in autistic spectrum disorders who helped found the National Autistic Society, said: "The moment the story broke, I thought he sounded as if he had classic autism. His repetitive drawing of a grand piano looks characteristic of someone with autism. It's the level of detail and something about the way they do it."
Dr Wing said people with autism tended to hate labels that touch the skin, which might extend to all labels, although this is also thought to be a means of trying to avoid identification.
"People in adult psychiatry are not trained to deal with developmental disorders such as autism. There are lots of additional questions concerning his level of ability and whether other details fit the picture of autism."
The NAS offered to help the authorities dealing with the case with diagnosing and treating the man, but it has heard nothing.
Uta Frith, professor of autism and Asperger's syndrome at University College London's Institute of Cognitive Neuroscience, said: "All the signs point to autism."
Simon Baron-Cohen, director of the Autism Research Centre at Cambridge University, agreed. He also offered to help diagnose or treat the Piano Man.
Jill Boucher, professor of neurodevelopmental disorders at Warwick University, said that autistic spectrum disorder was the most likely diagnosis, though she thought the man could also be mute as a result of having suffered a trauma.
Adrian Lowther, spokesman for the West Kent National Health Service and Social Care Trust, said: "It (the suggestion of autism) has been brought to our attention, and it will be considered as part of his care and treatment.
We cover learning disabilities, and there are a number of people who have some experience with autism and Asperger's syndrome. I'm sure that would have been looked at in one shape or form."