My cat got into a fight with another cat and ever since that day, she's been acting off. The day after the fight she slept in the same chair for the whole day (over 14 hours). I also noticed that she is purring way more, so when you go to pet her, she'll purr immediately. She has not been active and does not show as much of an interest in food.
I also found a swollen area on her lower back, the part that is right above the base of the tail. It was swollen for about a week and she wouldn't let me touch it, like she would meow and move, right away. This morning, i noticed some pus-like white residue on that section of her fur.
Is my cat alright? Will this swollen area heal by itself? Is there anything I should know about this?