CEREVITOSIS

One particularly rare expression of the 2020 Bug, Cerevitosis, damaged a part of the brain that limits the expansion of neural pathways, resulting in the brain growing continuously. As the grey-matter swells in the skull it begins to push into whatever cavity it can find, at extreme discomfort to the subject, the brain may grow out of the ear canal, nostrils and has even been known to push out the eyeball in a desperate bid for real estate. 

Some wealthy victims have undergone experimental surgeries to remove a portion of their skull and add housing onto the head for the brain to grow into, though these may have to be expanded periodically to accommodate the constantly ballooning tissue. This condition is often associated with a heightened intelligence, however it has actually been shown to push the affected to extreme ends of the bell curve, not necessarily up it.