my daughter is on Lamictal for epilepsy...petit mal seizures. She...

my daughter is on Lamictal for epilepsy...petit mal seizures. She started to develop skin disorder that a dermatologist says is achne. She has a swelling of her lips that he cant explain. Her neurologist says she isnt sold on our feeling it is lamictal related... The dermatologist has her on antihistameme and some lotion for her face... it is around her mouth and down the neck to her chest. She is 18... The breaking out on her face isnt red or blotchy...it is like pimples but no heads and more like gritty feeling to it.... any ideas??