Here are some signs that indicate you are suffering from a foot infection:

1. A foul smell.
2. The infected foot swells up
3. Pain and difficulty walking
4. The skin around the affected area is red and feels warm to the touch.
5. There is a white or yellow spot under the tip of your toenail
6. There is a yellow or green pus or fluid under the skin at the side of the affected toenail

Here are some things that can cause foot infections:

1. You can get fungal infection if your feet are damp for a long time, such as working in wet conditions or sweating in your shoes all day
2. Blisters can develop on your feet when you wear tight shoes. Blisters can get infected if you pick or burst it
3. A foot wound can get infected if bacteria enter from the wound
4. Your foot can get infected from the skin around an ingrown toenail
5. Diabetes can increase the risk of foot infections
6. You can get foot infections through surgery complications

Treating foot infections depends on the type of infection you have. Here are some ways to manage infections on the foot:

1. You can treat infected feet from wounds, blisters, ingrown toenails, and diabetes by using antibiotic medications
2. You can treat fungal infections with over-the-counter antifungal creams, gels, and medications
3. You can treat plantar warts with over-the-counter wart treatments.