I noticed a lump on my tongue about 6 weeks ago. At the time my mouth was a bit sore with a red lesion in the roof of my mouth. These symptoms went after my B12 injection. Unfortunately the lump is still there. It is still seen as a mystery after an MRI failed to shed light on it. I am having a biopsy next week requiring a general anaesthetic as it is way back near my throat. Could this be anything to do with PA?