Dogs wound has Pus..

Hi everyone! I got a new dog, her name is Zoey, she's very clumsy.. however I noticed one day that she kept on scratching her ears.. then it caused her to have a small wounds that turn to bigger wounds coz we can't stop her from scratching in.. So i tried to read some article and I discover this thinggy called e-collar so we can prevent her from scratching her open wounds, however as you can see on my profile picture thats kinda big for her. When I checked the wound this morning it already has PUS. She's not letting us to touch her wound, so I can't clean it nor put cream on it. I am not that rich, so at the moment I cannot afford to go to a vet, that will need a lot of money just for consultation. :'( I feel sad when I saw her situation that I can do nothing about this. I wanna ask some help, what should I need to do to make her wound easy to heal, and how can I make her to allow me to touch it, coz we had a terrible hard time just to wear that collar to her. :'( please help me. Also if you know any home remedies let me know. plssss :(