Symptoms of corns and calluses include:
- Skin thickening
- Toe pain
- Foot pain
- Heel pain
- Toe tenderness
- Foot tenderness
- Heel tenderness
- Skin redness
- Skin swelling
Features of corns and calluses include:
- Corns can range from a minor thickening of the skin to a painful, hard bump.
- Corns often form at the top of deformed toe joints, such as hammertoes.
- Many people get corns on the end of their toes when the toes rub against shoes.
- Corns can also grow between the toes, usually between the first and second toes.
- Less commonly, corns and calluses can become very painful.
- Swollen and painful corns may cause difficulty walking.
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- Coughlin MJ: Common causes of pain in the forefoot in adults. J Bone Joint Surg Br 2000 Aug; 82(6): 781-90. 
- Singh D, Bentley G, Trevino SG: Callosities, corns, and calluses. BMJ 1996 Jun 1; 312(7043): 1403-6.