<s>[INST] hi my husband had a accident about ten years ago and had blood on the brain. Since then hes has a quarters size hard lump on the back of his neck. Last night he woke up with a headach e and neck pain. He said it felt better after he massaged the lump. He says the lump doesnt hurt [/INST] Great question, sir. As far as I know, there is hardly any kind of head injury after which a definite lump appears as a valid complication of a head injury. It is here essential to know the time interval between the head injury and appearance of the lump on the back of the neck a temporary hematoma may develop which resolves in all cases after a variable period of time. The most possible cause of such a lump may be a Desmond cyst, but it appears very slowly over a course of years. Therefore, even if it is a Desmond cyst, one need not panic, it is a totally curable condition (by a simple surgery). A photograph of the head may be helpful in the diagnosis of such a lump developed after head injury. Thanks a lot! </s>