Hello, thanks for the query. Filariasis
is a disease in which if worm impacted in lymph
nodes so there become swelling if at the level of groin than the swelling will be on that side as in your's mother case. Previously it was on the left leg ,now on the right leg i.e still worms are there Diagnosis has made already. So diethylcarmazine is the drug of choice but add in this Albedazole . Ivermectine is also one more choice. In the impacted area there are more chances of bacterial infection so please take care of this also. As disease is from long time and spread all over the body so treatment will take long time to cure . Regular blood check up is also an important step. Take care of personal hygiene is necessary because otherwise some more problems will arise. Good luck . Dr.HET.