1) Those pics don't look like a brown recluse.
2) With all due respect to ER nurses, they treat people for the VERY short term then often send them home. I worked 2 years as a Med-Surg nurse where I took care of the spider bite vics AFTER the ER discharged them. My job involved the wound care and administering IV antibiotics for 3 to 6 weeks.
So I respectfully disagree that the bites are no big deal. Down here in Houston, I've seen A LOT of spider bites end up as serious MRSA infections.
Bottom line: keep it clean. Seek professional medical care if it hurts or if it appears infected (swollen, red, hot, or if you get a fever).