A hypothesis

Excess acidity promotes infection generally and also cancer.

Some cancers are known to be caused by viral infections, such as human papiloma virus causing cervical cancer.

Skin tags are BENIGN tumors -- growths -- caused by a virus.

Viruses are RNA. Two RNA make DNA. The D stands for "di" meaning two RNA.

Viruses can hijack the manufacturing parts of a cell. 

I strongly suspect most cancers involve a virus of some sort.

Natural antivirals exist.