The medication you are taking for the treament of epilepsy
is very important and has to be continued.
Now since you are taking three medication and which one is causing this problem is not confirmed. But antiepileptic drugs some times lead to allergic reactions.
Now it is important that you should consult your doctor regarding this problem about you allergy
because of medication and try to change the medication. There are many groups of drugs available for the treatment of epilepsy. It is important to take the most appropriate medication for epilepsy as the treatment for this condition is very long and it is not possible to take medication all the time to treat the side effects.
So I would suggest you to consult your doctor and change the epiletic medicaiton, which suits you the most.
Thanks and take care.