What illness causes small pus-filled bumps on the hands?

Small pus-filled bumps on the hands may indicate several different medical conditions, including: 1. **Impetigo**: A bacterial skin infection caused by *Staphylococcus aureus*, characterized by rice-sized blisters accompanied by itching and pain. 2. **Folliculitis**: An infection of the hair follicles caused by bacteria, commonly presenting as red papules and pustules, often associated with poor personal hygiene. 3. **Furuncle (Boil)**: Also caused by *Staphylococcus aureus* infection, characterized by redness, swelling, pain, and possible formation of a pus-filled bump. 4. **Tinea Manuum (Hand Fungal Infection)**: Caused by dermatophyte fungal infection,表现为手部脱屑、水疱和干燥，严重时可能形成脓包。 5. **Allergic Dermatitis**: Such as eczema or urticaria, which may be triggered by allergens and presents with redness, itching, and potential progression to pus formation. When small pus-filled bumps appear on the hands, it is recommended to seek timely medical attention to determine the exact cause and receive appropriate treatment under a physician's guidance.