I'm not sure if it's a blister of what..
i was super stupid and jumped onto a reallly brisk tredmill and i fell onl it and scraped my knee. it didnt bleed but when i got home this unusual puffy liquid filled this go where the red marks be. is this a blister of something else?
Answer: it's indicative of damage to your knee, here is swelling and discoloration, suggest you put ice on it for twenty minutes every hour for 24 hours, see a doctor if it gets no better.