Suggest Treatment For Swollen Red Spot On The Cheek

my dad 62 years old;5'5;168 lbs, is takin walferina (05mg) once a day. Tis morning he woke up with a red spot and swollen on the left cheek. It looks like rosella and we are concern. What is it? What's the cause? and WHAT CAN WE DO? should we take him to the ER. We have no insurance. Thank You