What's it mean when the veins on the bottom of my tongue are black?

Not Medical Advice: It looks like you have Tongue Disorders. The tongue's villi may become discolored if a person smokes or chews tobacco. Consult your Doctor.

Tags: veintobaccotongue 
Thursday, February 02 2012

Source: http://www.merck.com/mmhe/sec08/ch110/ch110c.html

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