Contact Dermatitis: This is the most likely diagnosis due to the presence of mild pruritus and scattered small blisters on the hand, which are common symptoms of an allergic reaction or irritant exposure to the skin.

Dyshidrotic Eczema: Characterized by small, itchy blisters on the hands or feet, dyshidrotic eczema is a common condition that could explain the symptoms.
Pompholyx: Similar to dyshidrotic eczema, pompholyx involves the formation of small, itchy blisters on the palms of the hands or soles of the feet.
Allergic Contact Dermatitis: An allergic reaction to substances like nickel, latex, or certain chemicals can cause blistering and pruritus on the hands.

Herpes Simplex Virus (HSV) Infection: Although less common on the hands, HSV can cause blistering lesions and must be considered to prevent missing a potentially serious infection.
Scabies: Caused by a mite, scabies can lead to severe itching and blistering, especially in areas like the hands, and is highly contagious.
Autoimmune Bullous Diseases (e.g., Pemphigus, Bullous Pemphigoid): These conditions are characterized by blistering skin lesions and can be severe, requiring prompt diagnosis and treatment.

Bullous Impetigo: A rare condition caused by bacterial infection, leading to blistering lesions.
Epidermolysis Bullosa: A group of genetic conditions that result in fragile skin and blistering, which could be considered in recurrent or severe cases.
Dermatitis Herpetiformis: An autoimmune blistering disorder associated with celiac disease, characterized by intensely itchy blisters.