When summer comes and it gets warm out, my feet begin to itch really bad to where i have to scratch them until they bleed or get sores?

Itch: This is very common in the warmer months and is usually caused by athlete's foot - a fungus infection of the skin. See your podiatrist for assistance .

Dermatitis: This sounds a bit like a condition known as dyshidrotic dermatitis, which commonly affects palms and soles of feet in warmer weather. This often does escalate to fluid filled blisters.It can be treated with topical steroids and sometimes oral steroids. If it is severe, a dermatologist can administer light therapy. Try using mild soaps and keeping your feel well hydrated. See your doc for diagnosis