What Causes Swelling In Eyebrow,stomach,legs And Hands?

My son had swalling in his eye bro, stomach, legs and hands. We admitted him to hospital and doctor said he is releasing albumin through urine and also in blood albumin is 1.7 and required level range starts from 3.5. Doctor has currentlyprescribed 15 ml of Omnacortil syrul daily twice. Quantity is fine or is there any typo error in the discharge summary report.