Superficial burn excreting pus?

If there was "pus", then I'd ume that it was a burst blister - which means it was a low grade partial thickness burn. This is more likely than an infected superficial burn. If it still hurts, douse it with water, and place clingfilm on it. If it doesn't, place clingfilm on it and then if it is possible, bandage the clingfilm onto the area. First ensure that if there was a burst blister, that the site is cleaned with clean water and gauze.