I tried to reply yesterday but my computer wouldn't cooperate. Normally I would say it sounds like cellulitis. However, in the absence of pain or increased heat in the area it probably is not an infection. If you get increased pain, fever, chills or drainage from the area then go to er. Keflex is the correct drug. I would have given you 250mg 4 times daily. also injecting the quad is a nasty area. I've had pain all up and down my leg from trying to inject test base in that area. Keep us informed