Symptoms:
Rounded, fluid-filled spots on the skin.

Cause:
They are most frequently caused by wearing different shoes or the excessive handling of tools.

Treatment:
• Decide whether or not you want to prick it and let out the fluid. It is generally best to prick large ones, and ignore small ones. But if it is likely to break, you do better to drain it ahead of time. Sterilize the area before doing this. Leave the roof on afterward; this protects the skin while healing occurs.