Hello I am Dr Ravinder Sharma ENT surgeon. On the basis of the iformation provided it appears that it may be related to ear
What is his age
Is there any history of ear discharge
Is he experiencing any hearing loss
Is he experiencing any pain in ear
Any difficulty in swollowing
Any history of diabetes
Any history of scalp
What makes you feel it is spreading to skull base
I suspect it to be malignant otitis externa
but I will need more information.
Please respond back with answers to abovementioned questions.