Growths that develop under the skin, which seem to be connected to the bones, could be bone tumors. These growths form when tissue such as cartilage begins to grow excessively, forming masses of bone and tissue. Like all tumors, they can be either malignant or benign. Malignant tumors are cancerous and can spread throughout the body. Benign bone tumors generally remain in one place and are only fatal if the growth inhibits other bodily functions.
The majority of bone tumors develop on the distal femur and the proximal tibia; in other words, the thigh bone and the area around the joint of the knee. If the tumor forms in or near the joint, a person might feel stiffness or a dull ache at the location. Many bone tumors form during growth phases and can exist for a person’s entire life without causing problems.
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