A blister is a raised, fluid-filled area on the skin and a common symptom with many causes. Friction, heat or chemical burns, viral infections, allergic reactions and some autoimmune or dermatologic conditions can produce blisters. Below are practical, general points about how blisters look, typical causes, when to consider medical assessment, and which specialists may be involved.
Blisters vary by size and cause: small vesicles and larger bullae are both fluid-filled but differ in scale. Mechanical rubbing, burns, contact reactions, herpes simplex, shingles, chickenpox and certain autoimmune skin disorders can all produce blisters. Areas exposed to repeated friction—such as hands and feet—are particularly prone.
Blisters may contain clear, bloody or cloudy fluid. The surrounding skin can be red, swollen, painful or itchy. Signs such as high fever, rapidly spreading redness, severe pain, or yellow-green discharge suggest possible infection and warrant timely medical evaluation.
Causes range from simple mechanical injury (friction or heat) to infectious (viral or bacterial) and inflammatory conditions. Primary points of contact are primary care or family medicine and dermatology. If infection is suspected, an infectious disease specialist may be involved; burns may require assessment at a burn center or surgical service. A clinician determines further testing and referral based on the likely cause.
Seek urgent assessment for rapidly worsening redness, high fever, severe pain, extensive involvement, or breathing or facial symptoms that progress quickly. To reduce risk, limit friction, protect skin from heat or chemicals, and keep skin clean. Avoid deliberately popping blisters at home—open wounds can increase infection risk; seek professional advice if a blister opens and signs of infection appear.
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