11 Letters Word Riddle - Hint

#190

I am a word made up of 11 letters.
My 8,4 is an acronym for that is.
My 9,10,6,3 is concealing stain.
My 7,2,1,11,5 is what the little boy did when his leg fractured. 
My whole is as little as it can get. 
What am I? 

  Difficulty Level - 3/5

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  Hint : 

  You can't see his sadness!!!