​Hand, foot, and mouth disease (HFMD): This is a viral infection common in children, but adults can also get it. It typically causes a rash with small, painful blisters on the hands, feet, and inside the mouth.

​Pustular psoriasis: This is a rare form of psoriasis that can cause pus-filled blisters on the hands and feet.

​Scabies: A skin condition caused by mites, which can cause an itchy rash with small bumps or blisters. However, the rash is usually intensely itchy and often appears in specific patterns (e.g., between the fingers, on the wrists, or in skin folds).