My one year old doughter has hives on her hands,legs and face,what can be done?

Benadryl (diphenhydramine): Call or see Dr very soon. Otherwise, go to an urgent care or ER. Hives can spread to tissue inside - like throats and block breathing. That's dangerous and you can't be certain if it will or won't. If you have Childrens Benadryl (diphenhydramine) ask the Dr for directions or you might risk this dosage guideline (not intended under 6yrs w/o approval): For infants and toddlers, 1 mg for every 3 lbs (24 lb baby = 8mg)

Hives: Does she have any problem breathing? If so, you need to take her to the emergency room right away, or call emergency services. If she is breathing well, does not seem to be in distress, still call her doctor. You can probably give her Benadryl (diphenhydramine syrup, 12.5 mg/5 ml) at a dose of 5 ml for every 10 kg of weight, every 4 hours as needed. Make sure you check with a doctor soon.

Hives: As long as only the skin is affected you can try to manage things by using antihistamines (diphenhydramine or cetirizine). She should be evaluated in the pediatricians office for investigating into possible cause. IF there is any breathing difficulties, lip or tongue swelling it is to the nearest emergency department you go (may be necessary to call rescue depending on severity for transport)

Allergic Reaction: If she has no other symptom like fever, difficulty breathing or vomiting and if the hives are not getting worse, it could be a simple allergic reaction which can be treated by Benadryl (diphenhydramine) syrup 1 teaspoon every 6 hrs. It can cause some sedation but should work. For any other symptoms listed above, pl see your GP or go to an urgent care. Ask the doctor to test her for food and environmental allergiesa