Why do i have these painfull blister looking on the ball of both feet what is it?

Many possible causes: There are many types and causes of skin blisters or rashes. Several types of inflammatory conditions of the skin, allergic reactions, and sometimes bacterial, viral or fungal infections can cause rashes on the skin. Insect bites can also be the cause of a rash on the skin. Have it evaluated by a professional and get the appropriate treatment.

MAYBE Athlete's foot: These are often caused by a fungal infection commonly referred to at athlete's foot. There are many different presentations and this is one of them. Use drying soaks (dilute vinegar or epsom salts). One of the otc topicals i recommend is lotrimin (clotrimazole) ultra. If this doesn't work, see a podiatrist.