Red rash on face

[bonnieb928]

My 3 year old has developed a red rash on her face and red bumps on her neck, chest, hand, bend of her knees, and the doctor is only saying it could be our new cat, but we have had cats in and out of our lives since she was 1 so i dont think that is it. Does anyone have any other suggestions? We have not changed our soap dterergant no new foods or anything like that either.

[Dr_Aparna]

Hi,
This does seem to be an allergic reaction.Common triggers include food allergies, drugs, viruses, insect bites and stings, plants, exercise, heat, and cold. Unfortunately, finding the cause of your child's hives is rarely easy; many times, you and your doctor will be unable to identify the exact cause. And like most allergic reactions, your child may have been exposed to the irritant in the past without any problem.
It's rare, but occasionally cold, heat, and sun exposure can trigger hives in susceptible individuals. Hives triggered by heat, cold, sun, and exercise are more of a mystery. Scientists don't yet know exactly why these rashes appear.
You can use cool compresses or a cool bath to reduce irritation and itching, but since hives are a reaction to histamine, antihistamines are usually the most effective treatment. Benadryl is available over-the-counter in liquid and pills.
Give Benadryl every 6 hours until the hives fade. Continue the medication, spacing the doses farther and farther apart, until you are sure the hives are no longer a problem.
ref:http://www.myonlinewellness.com/topic/hiveschild