welcome to healthcaremagic forum
it is not a common ,you must concern about it .
you have paronychia
.it is due to damage to very thin skin known as cuticle .
you need antibiotic and may require incision and drainage
it may be pulp space infection .
better to consult doctor
and get treated .
you can do hot fomentation to get rid of pain
do not squeeze or scratch the lesion ,there is chance of spreading infection .
i hope i have answered your question .