Thanks for writing in.
Median nail dystrophy or longitudinal splitting or canal formation in the midline of the nail. The split, which often resembles a fir tree, occurs at the cuticle and proceeds outward as the nail grows .
As in your case trauma may be a cause for the dystrophy.
Treatment can be avoidance of trauma.Topical treatment with steroid
drops daily or protopic
ointment(o.1%) daily can help after 3-6 months of treatment.
Before starting treatment confirmation of diagnosis is must.Habit tic deformity
or traumatic dystrophy closely mimics the median nail dystrophy.
If you can upload the photos of the nails it would be of great help in predicting the condition.
Photos can be uploaded by UPLOAD YOUR REPORTS SECTION.
Hope this helps.
I will be available for follow up.