I'm having blisters on the palms of my hands, soles of my feet, on my tongue, on my head and my genitals, accompanied with sore throat.

Blisters: Hand foot & mouth disease is a viral illness that can have blisters in the mouth, on palms, soles and other areas of the body. There are a number of conditions that can cause similar symptoms, including reactions to medications, erythema multiforme (which may occur after other infections such as herpes or pneumonia) & others . Please see your dermatologist as soon as possible for proper diagnosis.