Causes
Causes of blisters include:
- Friction or constant pressure, such as from wearing a tight-fitting shoe or gripping a tool
- Second-degree burns, including sunburn
- Viral infections, such as chickenpox or shingles
- Fungal infections such as athlete’s foot
- Contact dermatitis, such as poison ivy or oak
- Allergic reactions, drug reactions, certain cancers, and inflammatory conditions
- Severe skin swelling, especially of the legs
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