bruised gums?

[cdef56]

I had my right upper and lower Wisdom teeth extracted along with the molar in front of my left upper wisdom tooth. Everything seemed to go fine and I seemed to heal well, My gums had even started to grow around one of the stitches in my upper left molar. I had my stitches out 9 days later. That was about a week ago, and now I noticed that the gums on my upper left side near the molar are a purple-ish color? It is also still sore when I swallow, but only on that upper left side. Can they be bruised? Is there an infection? I'm hoping whatever it is I can clear it up at home but any input or advice is greatly appreciated seeing as my dentist is closed on monday and tuesday so I can't be seen for 3 days anyway. Thank you so much in advance!