Difficult to know...: Without a formal exam, but if he has a bruise on the back of his head it is most likely from an injury as opposed to an infection. "Bloodshot eye" may be unrelated to the bruise. This may be due to him rubbing his eye, or possibly something irritating the eye. He may have a pinguecula on his eye, but without seeing the "pimple" it is only a guess. Best to have it evaluated by a Dr in person!
Answered 4/30/2015
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