... itchy hives on her hands. I stopped the percocet after her Friday morning dose... it is now Sunday morning and she is still experiencing the hives only they have expanded onto her arms and legs. She also vomited Saturday morning and had a low grade fever during the day Saturday. She woke with night sweats last night, but seems to be feeling better this morning except for the hives. Do you think the hives are due to the percucet or part of something viral she's picked up?