There are a number of different causes of lumps and bumps on the bottom of the foot. Working from the toes to the heel:
1. Lumps and Bumps on the Bottom of the Big Toe
A painful lump may be found on the bottom of the big toe. This condition often presents itself as a hard callused area. Sometimes a hard lump may be felt beneath the callused area. The most common cause of this condition is a limitation of movement of the big toe joint while walking. If there is limitation of movement at this joint, then the big toe cannot bend upward as the heel comes off the ground while walking. As a consequence, there is excessive force placed on the bottom of the big toe and an enlargement of the bone in this area will occur secondary to the pressure. Another cause is the presence of an extra bone or piece of cartilage in the area. However, it is the limitation of movement in the big toe joint that causes the area to become enlarged and painful.
People who have diabetes must watch these areas closely. Over time, the excessive pressure can cause this area to break down and ulcerate. One way to check to see if there is a limitation of movement of the big toe joint is to perform the following test. While standing on a flat surface, have another person try to bend the big toe upward. The joint that must move is the joint where the toe attaches to the foot. There is a joint in the middle of the big toe and this is not the one you are checking. If the big toe joint cannot be bent upward then a limitation of motion exists. Testing the movement at the joint without putting weight on the foot will give a false impression as to the available movement at the joint while you are walking. This limitation of movement of the big toe while walking can, over, time create an arthritic condition in the joint. A bony mass may then form on the top of this joint as a result of jamming in the joint. This condition is called hallux limitus or hallux rigidus. Treatment for the painful lesion in the bottom of the big toe joint consists of using functional foot orthosis to correct the functional limitation of the big toe joint motion or may consist of surgical correction of the hallux limitus. Rarely is surgery to remove only the lesion on the bottom of the toe alone, successful, because the cause of the initial problem still exists.
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Knee pain in children may be caused by a variety of conditions. Some of these conditions may be rare but can be quite serious in nature. Knee pain in children should be evaluated by your doctor.
A common cause of knee pain in a growing child is injury to a growth plate in the front of the knee. This may be accompanied by swelling in the area. This condition is called Osgood-Schlatter's disease. It occurs most commonly in children between the ages of 10 -14. It is often associated with playing sports and aggressive bicycle riding. It is felt that the condition is primarily caused by an abnormal pull of the tendon that attaches into the painful area from the kneecap. This tendon is called the patellar tendon.
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