Purple gums

[Berry]

Has anyone ever heard of purple, bruised gums, or had seen them before? I am under the care of a rheumatologist and a dentist. My gums and teeth are otherwise healthy, not swollen nor painful, just purple in multiple spots stemming from blood clots or bruising. There are many vertical linear blood vessels seen in the affected areas. The discoloration started towards the end of February and they are on the upper and lower outer gums.

My dentist, a clinical instructor, has seen 2 cases similar to mine and she doesn't know the cause. She told me not to worry about it since I have no bruising or discoloration anywhere else. My rheumatologist took me off autoimmune meds and the discoloration still persists. She has never come across purple gums. They are baffled, and so am I. Any insights would be very appreciated.