It is possible you have mild ptosis or drooping. Go and see your doctor and they can check you out and see if it is a problem. The good and bad news of botox is that it lasts 3 months.
One week after botox if you don't have any lid droop then the swelling is likely due to internal bruising. Check back with your injector for an exam and determine if that in fact is the case. Alternating ice and heat may hasten the recovery.
Thank you for your question. Without a photo difficult to give advice. Botox has its full result at 2 weeks. You would of seen ptosis and if it was a diffuction it would have resolved in 1-2 weeks. Swelling may be a result of bruising. You should see your injector for an examination. Best Woshes.
I suggest posting photos or speaking directly to your physician. This is possible but rare. Best, Dr. Emer.
It is possible that the Botox has had your eyelid swollen but without a photo it is impossible to know. I suggest you return to your treating physician for examination. Please keep us posted.
Unfortunately, it is very difficult to give you advice about your eyelid after your Botox treatment without examining you or at least seeing a picture of the problem. You stated that your eyelids are equal and that there is no droop, so it does not sound at all like ptosis. It does not sound like something that Benadryl would help with either. My best advice would be to return to the physician who treated you so that you can be evaluated to try and determine what is causing your issue.