Hi Sanjay,
Thanks for posting your query.
After reading your whole query, there may be possibilities of nervous system damage and impaired blood supply.
Has he undergone
x ray of the affected limb? What was its reports?
As your friend is not feeling sensation, there may be possibility of nervous system involvement.
Swelling with damaged skin layer indicates involvement of blood supply.
There may be possibility of simultaneous involvement of both system.
There may be following other possibilities:
Cellulitis in affected limb, underlying
crush injury.
You should consult with surgeon and orthopedic surgeon and go following investigations:
complete blood count, color doppler study of affected limb,
nerve conduction studies of affected limb.
Take care,
Dr. Mayank Bhargava