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In general fungal infection is the most common cause of deformed toenails. Other causes include trauma or chronic pressure from abnormally fitted foot wear, or autoimune connective tissue condition such as scleroderma, rheumatoid arthritis, psoriatic arthritis
. If such changes involve the root of the nail, it is possible for the deformity to be permanent. Your doctor through careful examination would determine that, but it is unlikely based of the your description. In general, the course of growth can be re-directed with treatment of the underlying cause.
If you doctor determied that you do not have a nail fungi by testing the nail in culture, then it is not fungus. However, if the nail was not cultured or tested to determine the nature of the nail, then I suggest that a culture is needed to conclusively diagnose this condition. On the other hand, to consider other possibilities, I suggest that tests including ANA, RF, ESR, C-reactive protein, Scl 70, and/or ANCA panel be tested to help in the search for the underlying cause, and determine the best treatment.
In the meantime, I suggest that you wear wider front-based foot wear and maintain good vitamin supplements especially B-complexes, C, D, and E. If you are determined to have one of the above connective tissue condtions, then treating it will help in re-directing toenail growth. I suggest that you share this information with your doctor for further consideration.
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