Brief Answer:
Explanation given

Detailed Answer:
Thanks for asking on HealthcareMagic.
I have gone through the attachment. It seems to be the histopathological findings from a post operative sample of the front and back portions of the tongue. Our body is made of different types of tissues and they in turn are made of various types of cells. The cells are so differentiated that the cellular organization of one type of tissue differs from another. Thus, the composition of skin is different from that of the liver. When there is loss of cellular organization and clear distinction is no longer present, it is called dysplasia. Dysplasia can subsequently lead to cancer. Such a dysplastic change is not present in the tissue sample obtained from the resected tongue. The changes that are seen, are nothing but thickening of the upper and outer layer. Such thickening is called keratosis due to the deposition of keratin.
Hope that clarifies your query.
Regards

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Brief Answer:
It is not dangerous.

Detailed Answer:
Parakeratosis or squamous epithelial hyperplasia is not dangerous in itself. Nevertheless, it is difficult to remove. You have to get the opinion of a skin specialist.
Regards

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Brief Answer:
Underlying health problems are not mandatory

Detailed Answer:
Smoking is the commonest cause of such parakeratosis. In your case it seems to be of the harmless variety and is not a cause of concern. But there could be other possibilities like the ones mentioned on:
XXXX
(sorry for the technical nature of the document)
Another possible cause is friction
XXXX
Regards

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