Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
As per your complain and presentation of symptoms the brown coating of tongue is due to a condition known as
BLACK HAIRY TONGUE due to which there is brown to black coating over the tongue..
It is a non-fatal condition and can be caused due to a number of common conditions like excessive bacterial and fungal growth in mouth, poor
oral hygiene, excessive intake of antibiotics, over intake of tea and coffee, getting
radiation for head and neck, taking bismuth containing medicines etc..
In case of
HIV positive individuals it is commonly seen and especially HIV POSITIVE MALES..
You should consult an Oral Physician and get him evaluated and the treatment will depend on the cause..
In case of bacterial or fungal overgrowth antibiotics or antifungal medications will help..
In case of overgrown tongue papilla using a tongue cleaner for cleaning the tongue and using a soft brush to scrub the tongue will help..
Maintaining a good oral hygiene and taking raw fruits and vegetables will help in cleaning the tongue by frictional action and shedding off the overgrown papillae..
Hope this information helps..
Thanks and regards..
Dr.Honey Nandwani Arora.