Although most ringworm infections are commonly found in areas of the body where the skin is fairly flat and open to exposure, ringworm can affect any portion of the human skin. Being that ringworm is caused by a fungus, and fungi are very resilient and hardy little organisms, any portion of skin that comes into contact with these fungal agents is at risk. Applying a ringworm treatment the moment you suspect an infection will not only minimize the chances of the infection getting worse but also of you spreading it to others.
As with almost all fungal infections, the earlier that you can begin treatment once the infection has shown itself, the quicker the treatment period will be. Letting a ringworm infection go untreated will only result in the infection getting worse and perhaps the emergence of pustules or painful blisters. And there is no benefit to avoiding treatment. In most cases, a solid cure can be found in the form of a cream or ointment that is very easy to apply.
In addition, ringworm infections can only spread from person to person when the blister is alive and still active. So by avoiding treatment, an infected person is putting other people in jeopardy by not addressing the infection right away. Ringworm infections will usually only last up to three weeks at the most if a reputable ringworm treatment is used the moment the infection is found.
Lastly, be careful about what you touch when you have a ringworm infection. It is fairly easy to avoid catching ringworm if you know what people or animals are infected. But many cases of ringworm are spread through contact with public surfaces where a person had no idea fungal agents were present. By not touching your ringworm infection (other than applying treatment), you can minimize the chances that the infection will be spread.