There are a number of different colloidal solutions that can be used to treat skin diseases. The most common and effective one is silver colloid. This solution works by interacting with the bacteria on the surface of the skin, causing them to be killed off.
This can help to clear up conditions such as acne, eczema, and psoriasis. Other colloidal solutions that are sometimes used include copper and zinc.
These can also be effective, but they may not be as strong as silver colloid. If you are unsure which colloid to use, speak to a doctor or dermatologist who can advise you on the best solution for your particular condition.