Thanks for writing to health care magic
I think the description provided by you fits
into what is called unilateral clubbing.
clubbing is seen in various disorders of the heart, lungs etc. but is seen in both the hands and feet in such cases.
Unilateral clubbing is seen in conditions of vascular abnormalities involving a limb.
does your child have any other associated complaints
since how long are you observing these problems
your child needs to be examined and investigated for the same
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I will be greatful to help you out
hope this helps