 A number of complications may occur , with infections being the most common . In order of frequency , potential complications include : pneumonia , <unk> , urinary tract infections and respiratory failure . Risk factors for infection include : burns of more than 30 % TBSA , full @-@ thickness burns , extremes of age ( young or old ) , or burns involving the legs or <unk> . <unk> occurs particularly commonly in those with inhalation injuries . 
