Help me!!! I woke up with a sort of blister on my knee... So I popped the blister and cleaned it. I assumed it was a bug bite of some sort and went about my day. But over the course of the day my knee only worsened :( it became swollen and so red that my boyfriend even expresses his concern and said I needed to go to a doctor. I just got out of the bath so it's gone down a bit but it's so tender and it hurts. Someone tell me what it is! I had another blister on my other leg that I popped as well the same

Day and it's not as bad as this one :( help please