The advice assumes that we are all out of control and going to be in grave danger from the small injury of corn removal.
Having had several nasty bites on my lower legs from the local flies, when I was stranded outdoors at dusk just over a week ago, I can attest that normal healing is possible - though perhaps consult your GP surgery to see if they have any suggestions as there might be a local option for personal treatment.
There is a high number of elderly people in care homes in this area and there was a travelling foot specialist available when I worked at one though it was some time ago. The need must still be there.