

It's called skin .
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Rover_KE.Note that the skin doesn't 'leap out' of the drink.I see -- but doesn't it happen sometimes that when a person takes a powerful sip of his tea, the skin comes out with a force and lands all over his mouth?
Mr. TomIs there any name of that offensive layer in English?The word "offensive" is a strange and unnatural one in this context. It would be better to say that it is unwanted or unpleasant.
Mr. Tom when a person takes a powerful sip of his tea,..A sip is a tentative, cautious taste of a liquid - especially one that you suspect might be very hot or unpleasant.