Dark Bluey Grey Tongue!

[miniskirt]

Hello to you all (whom I love), I was diagnosed with PA in 1992 when I was 39yrs old & I am so grateful for this site. I noticed a couple of hrs ago that parts of my tongue had turned a funny colour, I thought it was Black at 1st but on closer inspection saw it was like a 'Slate Grey' colour, it's patchy & slightly sore round the edges and sore round the inside if my mouth & my neck is especially sore, I realise that they may not be connected (ha ha symptoms I mean) but thought it may be worth a mention. Do you think this is due to my PA or may be something else? Thanks in advance for your advice & take care.