Conversation: The conversation between human and AI assistant.
[|Human|] hi i have what i think is a mouth ulcer but the strange thing is that it has a black spot. i have had one or two before in the same place but never noticed the black spot. it is at the back of my mouth between the two rows of teeh on the rhs and is clearly visible when i open my mouth.
[|AI|]  Hello, You may have a viral ulcer since you report this location with a prior occurrence. The changes with inflamed tissue may appear very dark. Trauma to an area with Chat Doctor.  Different pigmentations in tissue can be normal such as a nevus or a change of tissue color can indicate concern requiring a biopsy to evaluate for a melanoma. An amalgam tattoo can occur with removal of older filings. I suggest rinsing the area with warm salt water. Maintain a soft diet, gentle daily dental care, stay HY