I looked closely at your photo but I wonder which "patch" you're referring to?
There is a very tiny whitish speck just inside the opening of the ear which really looks just like a bit of flaky dy skin, probably nothing to worry about.
However, deeper in the ear, there appears to be a larger area of whitish scaly-looking plaque which might be sitting very close to or on the eardrum itself. If your child has had an ear infection before, sometimes this may be a patch of tympanosclerosis which is basically an area of slight benign scarring on the eardrum, which we do see relatively often.
For confirmation and your reassurance, I advise you to get his ear thoroughly checked out by an ENT specialist who can examine the ear carefully under a microscope.
Hope your kiddie stays well!
