Colloidal silver is a natural;

Antibiotic

Antiviral

Antifungal

It has been used for centuries as an antibiotic lasting until the invention of penicillin. It is still commonly used in hospitals in the pediatric wing when patients can't handle pharmaceutical antibiotics. 

To use the Colloidal Silver simply apply to the infected area as directly as possible. That means spray on to an external issue, drop into eyes or ears, or injest for internal issues.