I have a possible m.s. diagnosis and when i touch my forehead it feels really sore like it's bruised but there's nothing there?

If vision...: If vision loss, blurriness, pain when moving eyes is associated with this issue then it is likely from a presumptive diagnosis of MS. Otherwise, hard to say, MS comes with a myriad of pain patterns. Of course without the MS, I would not be concerned about this complaint alone.

See doc: I think it is unlikely related to the MS but more likely to muscle tension, trauma , or less likely sinusitis . See doctor if this problem persists.