The tongue is the only muscle in the body that is not covered by skin. This makes the tongue an excellent window for seeing what is going on with the rest of the body. The acupuncturist is looking at the shape of the tongue, the tongue coating, tongue colour and texture changes such as cracks, sublingual veins and papillae.
Cynthia's Classical Acupuncture and Wellness 
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Hmm, no I’ve never had that issue. Hope it gets sorted out soon:)