Resolving right action & intention in a white lie

I know that lying is unskillful in general but in the case where saying the truth could hurt someone and its necessary to lie in order to heal that person **but you cannot fake the lying in front of him/her since it would be obvious you are lying** rendering the method ineffective.So in accord with right action and intention how can this be resolved? I read this question Does any/every form of lying violate the precept of “not-lying”? which justifies white lies. However **Iam concerned with saying it genuinely**,if you are going to say a series of lies one after another and you don't believe they actually happened it can be hard not only to genuinly say them but to have a conversation about facts .