My 16 yr old daughter has been experiencing ramdom swelling of areas on her body, mostly hands and feet, but occasionally upper arm area, legs, waist area, etc. The swelling is not around any joints, but rather in soft areas such as the side of her foot, or the heel of the palm of her hand. It starts with intense itching, then starts to swell, gets red and hot. I took her to after hours clinic, and they want her to do 3 days of Prednisone, and follow up with her primary. She is already a little overweight. Will 3 days of Prednisone cause her to gain weight? What other negative side affects will it have?