Strange Gum Discoloration

[Lawrence Watson]

I only recently noticed some discoloration in my gums, and I'm wondering if anyone has any ideas what this may be. (If I have my tooth naming correct) It starts on my left 1st bicuspid with a dark bluish tint in the gum right under the tooth, almost like a bruise. But then there's a yellow tint that spans from there through my right 1st bicuspid.

I did change my diet to a vegan diet about 9 months prior. However I had my physical recently and found only some deficiency in Vitamin D and my HDL cholesterol is a little low.

Thanks for any pointers!