rash question?

My daughter (8) ocasionally suffers from a rash on her face and neck area after exposure to sun and heat. This usuallly only occurs at the beginning of summer and the Dr. calls it contact dermatitis and prescribes Pediapred (liquid prednisone). Well it's back and I put sumblock on her which didn't prevent it. I really don't want to keep putting her on a steroid. Any personal experience with this? I know I know... call a Dr. already have just looking for public feedback or first hand experience.