efudix cream skin mets

Dear all
At the same time as breast cancer I have also experienced continual skin cancer removals(pale irish skin, growing up in Perth , Western Australia - beach culture and many sunburns). I have had various growths removed and have just been given a treatment of cream for home called Efudix. When I read the pamphlet I find it is known as 5 - fluorouracil - which ids the same name for Xeloda isn't it? ( the next chemo I may try). Would it be effective as an external treatment to skin mets if it is used internally. It is a cream which you apply 2ce a day for ten days and makes the areas red and sore and then improve. i am going to ask the onc but wondered if anyone else knows of this.

Thanks
love
lindaw