Hello Thank you for trusting HCM Dear green tongue can be a sign of several serious medical conditions . Dear why you are using oxytocin using??? Causes of green tongue 1.geographic tongue :harmless lesions on the tongue that may change color. Initially, lesions caused by geographic tongue may appear red with raised white borders, but those borders may change to a green color over time. 2 . hairy tongue syndrome :occurs when a certain type of cell on the tongue doesn’t shed as it should. This gives the tongue a rough or “hairy” appearance. This rough surface creates a place for bacteria and yeast to thrive. This can discolor your tongue, causing a green hue. 3 . lichen planus :it is a rash-like condition that can cause tongue discoloration. Usually lichen planus on the tongue occurs as a white color. It can change green when bacteria or yeast begins to grow on it, certain foods or drinks are consumed, or certain products are used. 4.oral thrush and oral malignancy :can cause green color tongue. It may be due pseudomonas infection , billiary problems, metabolic syndrome etc.. You have to be evaluated systemically so please consult your doctor he will examine and treat you accordingly. I think I answered to your question if you have more questions please feel free to ask me.