Thats probably a 2nd degree burn, since your getting a large blister filled with puss.
-Submerge the burned area in cold water, do not use ice. At least for 20 minutes.
-For the pain you can take some sort of pain reliever.
-If the burn isn't 3rd degree, or very large there is no need for a doctor.
-Rinse it regularly, and let air dry.
-Cover it with bandaid.
-You can use the aloe for the red area, and some sort of burn/antibiotic cream for the bad part.
-Its important to make sure its not getting infected.
Basically, you need to judge how bad it is and figure out whether the doctor is necessary.