cancer
We know that cervical cancer is related to the human pappiloma virus, thus the annual "pap smear" for women. Warts and fever blisters are both caused by virii and cause growths, similar to tumors. I can't think of any parasites, bacteria, or fungi which causes similar growths -- and I've tried. (Anyone who knows of something else which causes tumor-like growths, please speak up. This question is of serious interest to me. Cancer runs rampant in my family.) Molluscum contagiosum is a viral infection which causes growths on the skin similar to skin tags. The cause of skin tags is "unknown" (yet it seems logical to me it is some other virus) but they are described as "benign tumors".
Although conventional medicine seems to find viral infections extremely hard to combat, alternative treatment circles I hang out in find viral infections very easily treated and offer a number of different options for doing so. I believe that I and my sons have been killing off whatever virus or virii we carry which eventually could/would turn into a diagnosis of cancer. I get die-off rashes that include skin tags and brown and red spots of the sort which look like pre-cancerous lesions. My oldest son has a very keen sense of smell and has been around several family members who had cancer. He says he can smell it when we have cancer die-off. Given my experiences with him, I believe him.
I generally don't talk about this in public. My personal problem is that people tend to either call me "arrogant and egomaniacal" or "a liar, charlatan, and snake-oil salesman". "Arrogant and egomaniacal" is probably the better thing to be accused of as it suggests people think it can be done, just not by little ole me. "Liar, charlatan, and snake-oil salesman" suggests people think it can't be done at all, by anyone, regardless of the resources at their disposal, much less by little ole me and my limited resources. I don't believe any technology will solve my personal issue of being accused of such things. It's an issue of "the hundredth monkey" or "mindshare" or "groupthink"....something along those lines -- ie: No one else is able to do it, so you can't possibly be telling the truth. To quote an old TV show: "There's always a first."