cin 3..unclear margin..could it return?

Hi ladies i had lletz treatment 5 weekz ago for cin 3..I rang nurse for result as was impatient..she said was cin 3 and that one margin wasnt as clear as they like but when they burn it it should have destroyed any left..my letter didnt mention this margin just that was cin 3 no cancer detected and follow up in 6 months..im worried there is some left :( could this mean that in 6 months it returns?? I had so many Infection following the lletz that hate idea of having that again ...has any one else had it return xx