Be aware that there are many bacteria present on human skin and many are pathogenic and can form biofilms which prevent healing.
Silver might be worth looking into but might not be effective against highly Antibiotic resistant bacteria which are protected by a biofilm.
Essential oils to inhibit Quorum sensing might be helpful. BFB 1 and BFB 2 are the most complete essential oil formulas against biofilms.
Bacterial efflux pumps might also be worth looking into because it is what protects bacteria against antimicrobial substances. MRSA is a very common bacteria which forms biofilms and is highly resistant.
Cinnamon essential oil (Ceylon type) is highly effective against bacteria, even those protected by biofilms but it can cause some problems and is not recommended for use on the skin unless diluted substantially. Emulsifying the oil might be helpful as the drop size would be extremely small. Tween 20 can be used as an emulsifier. I would recommend you read up on Cinnamon eo before even thinking about using it. Great care needs to be used when using it. The last thing you need is to make a bad situation worse ;o)
Emulsifying all these oils would help to stop them from coalescing into a concentrated mass which would not cover the area well. Having tiny droplets would make it more effective and less problematic. I am trying this myself for reasons other than cancer but ran into some problems on ebay with a seller who sent me the wrong ultrasonic cleaner. The trained monkeys at paypal sided with the seller and could not of looked at the evidence. Fortunately ebay found in my favour so I now have the refund. That has delayed my progress and it will be the new year until I can get what I require. I do have some organic cinnamon eo myself which I intend trying. I have some Tween 20 and I want to get some BFB 1 and BFB 2 as soon as the new year is out of the way.
A problem with cancer can be with the nervous system in the area which delays healing, clearing of waste products and oxygen and nutrient availability. The areas can feel colder than other areas. This makes for ideal conditions for cancer.
Do some reading on biofilms and skin infections for ideas.