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Walking is one of the best forms of exercise, but sore feet can impede a good habit. When feet get sore from common rashes, it is important for your health to seek treatment. Common rashes are caused by fungus, allergies, sweating in footwear, or stress. If these rashes go untreated, bacteria can infect the feet. Read about these types of infections on Fungal Guide. Known as athlete's foot, tinea pedis is one of the most common skin problems. Caused by a fungus, tinea pedis is spread by contact, often in public places such as locker rooms and gyms.