I had what looked like a spider bite, two little dots found them when I woke up with intense itching in the area.  Fell back asleep, woke up to find a 50 cent piece size red circle surrounding the area.  Over the last five days the red area has grown and has little bumps covering the red area, many of which are weeping what looks like a watery substance.  But Ive been cleaning and bandaging the area in breathable gauze and when I change the bandage it leaves a yellow stain.  I thought it might have been a brown recluse but nothing has turned black so I thought it was going to be ok.  But it seems to be getting bigger and the redness is looking darker.
This bite does not sound like brown recluse as their bite would not react in this manner. This sounds more like a bed bug or mosquito bite that has become infected. I recommend that you see your doctor for possible antibiotics to help heal the infection.