I had a client present with a black tongue coating over a deep red body, but reported general good health. No bad health symptoms. Never seen this before in 13yrs practising. I treated her to reduce heat, stagnation & nourish yin. Any other suggestions on the presentation of a black tongue coating?I can’t find much info on it. Thanks.
Of course there are all the TCM reasons for a black tongue described on this site and in texts. But from the western side of things you should check if the patient is taking large amount of iron and/or taking something like pepto bismal - either of which will cause the black fur on the tongue.
To help further on the TCM side I would have to know a lot more about their health - everyone has issues from a TCM perspective to lock onto regardless of their overall state of "health" from their perspective.