I have unexplained redness and bruising?

I have had a redness on my mastectomy breast that has spread to my chest and face.? My PCP ran a bunch of labs that didn't come back, and I'm freaking out about what this could be. The labs produced obnoxious bruises and everything seems to make my skin red. I don't think it is infectious, but am on an antibiotic anyway. Oh, and I have pink eye with this too. Two tests that did come back negative, lupus and lyme. What are your thoughts?