Sores and blisters. Ringworm infections very often create blisters that erupt with pus. The liquid will often form a crust that will develop into a hardened or scale-like skin. The area at this point will shed flakes, and itch severely, and be quite tender as well. This usually occurs between the digits, but it could also happen on the sole or on the sides of the feet. Generally speaking, blisters of this sort do not form in the upper region of the feet.
A one-sided rash. Ringworm infections start with the skin becoming thick and rough, with rashes forming on it in a ring-like pattern. This is usually accompanied by tenderness and a lot of itching. For some obscure reason, the rash often occurs on just one side of the body. This isn’t to say that the rash will not sometimes affect both sides of the body, but this is actually relatively uncommon.