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Foot Disorders : Subunqual Exostosis

This is one of the more common bony lesions of the foot.  It is a benign tumor of bone and cartilage. It is generally found underneath the toenail and may press upwards resulting in deformity of the nail plate and/ or soft tissues.  In severe lesions, the overlying tissues may ulcerate and become infected. This lesion responds well to surgical excision, and rarely reoccurs.




Symptoms
  • Deformity and separation of the nail plate, expansion of the soft tissues
  • Direct pressure on the nail may be painful
  • Aggravated by wearing tight shoes.
  • There may be signs of ulceration and infection.
Causes
  • Cause is unknown, but believed to be trauma 
What you can do
  • Consult a podiatrist or physician
  • Avoid tight fitting foot wear
  • If an infection develops soak the foot in a basin of warm water two or three times a day.  Contact your podiatrist or physician immediately.
  • Abnormal growths and  infections  require prompt professional attention.
What the doctor may do
  • Take x-rays or perform other imaging to establish a correct diagnosis.
  • If the toenail is causing problems, it may be removed
  • Treat any infection present with antibiotics
  • Surgically remove the exostosis
  • Completely remove a deformed toenail so it will not grow back.
Other conditions resembling a Subungual Exostosis
  • Other, more serious, bone tumors may resemble an exostosis.  
  • Evaluation by a trained practitioner is essential
  • An infected ingrown toenail may resemble an ulceration from an exostosis
  • Chronic in-growing nails can cause deformity of the nail plate and/or surrounding soft tissues.




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