Hello Shelia,
It is not that unusual for a Brown Recluse bite to reappear even after completely healing. It is believed that it is due to pockets of venom underneath the skin. Sometimes the bite wound will reappear in different areas of the body as well. Antibiotics will help keep various areas from getting infected but they do nothing to rid the body of venom.
Keep us posted as to your progress. Meanwhile, RICE therapy (Rest, Ice, Compression, Elevation) is generally recommended to help keep the affected areas from getting worse.
Tom
www.brown-recluse.com