I have a bunch of tiny liquid filled blisters under the skin on my heel. i've had them before on my thumb and then between two toes. they itch.

Herpes type virus?: This may be a herpes type virus. This is not an uncommon statement. This also could be related to an some type of allergy but the history is more suggestive of a viral origin. Show your doc if they last that long.

Fungus?Have you: tried over the counter anti-fungal cream?It may take over a weeks worth of treatment.Follow the instructions.If no improvement,seek further medical attention.