Which medicine is useful for foot fingers itching...

What is the treatment of Skin itching and allergy ?
You have to do clinical assessment in the nearest medical center and avoid scratching the skin as much as you can and Wear comfortable shoes with good attention to your personal hygiene and use creams such as Triderm twice daily
What are the causes of Skin itching ?

1. Tight shoes 
2. Prolonged standing
3. Skin allergy
4. Fungal infection
5. Bacterial infection
6. Sweating
7. humid atmosphere
8. Viral infection

What Should you do at the moment ?
You should follow the tips and advice provided to relieve itching of the skin . If there is no improvement , you should consult your dermatologist for assessment