first i will answer your tonsil
problem , yes you are right enlargment of one tonsil may be sign of lymphoma
but you said that when you push your tonsil white little pieces comes out and thats never happed in lymphoma!....your tonsil problem we call it tonsoliths and its simple and you dont have to worry about.
and about your inner cheek's dot its usually cased by trauma from your teeth or more commonly caused by aphthus ulcer......again in leukemia
usually the ulcers are multiple and accompanied by enlarged bleeding gums
with lymphnods enlagement
and finally your leg problem i think it is due to scratching, and if you are still worried about that you can do complete blood picture for reassurance.....hope you all the healthiness