Athlete's foot is a fungal infection that develops in the moist areas between your toes and sometimes on other parts of your foot. Athlete's foot usually causes itching, stinging and burning. Also called tinea pedis, is the most common type of fungal infection. It's closely related to other fungal infections such as ringworm and jock itch.
Just apply to infected area twice a day until area is clear.

Cracked Heals - Wearing flip-flops and walking barefoot may be one of your favorite things about Summer weather, but unfortunately it can damage the skin on your feet. The constant exposure to air dries out your delicate skin, creating calluses. The pressure of pounding your feet on the ground when you walk or run exasperates the issue and causes heel fissures, or cracks in the skin.

Foot Odor - The quality of foot odor is often reported as a thick smell. Some describe the smell like that of malt vinegar. However, it can also beammonia-like. Brevibacteria are considered a major cause of foot odor because they ingest dead skin on the feet and, in the process, convert amino acid methionine into methanethiol, which has a sulfuric aroma. The dead skin that fuels this process is especially common on the soles and between the toes. The brevibacteria is also what gives cheeses such as Limburger, Bel Paese, Port du Salut, Pálpusztai and Munster their characteristic pungency.
Apply to both feet to cover entire foot before putting on socks daily.  Problem solved!