Our expert says:
Blisters under an area of callus are quite common and can be very painfull. The secret is to make sure the skin does not get hard and callused to begin with. Check your shoes, you may be in the wrong shoes, causing excess pressure in the area. Keep the skin soft and supple. If necessary see a podiatrist who can take of all the callus and then you need to use a pumice stone or similar to keep it of. Once the area becomes hard and callused its almost inevitable that a blister will develop under the callus.
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