While Augmentin (amoxicillin/clavulanic acid) treats bacterial infections and Ultracet (tramadol/acetaminophen) manages pain, worsening redness after three days could mean a few things. It might be a reaction to the spider's venom rather than a bacterial infection, or the infection could be resistant to this specific antibiotic. Because it is getting more painful, please have a healthcare provider re-examine the bite. They can ensure it is healing safely and adjust your medication if needed.
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Why is my painful, itchy spider bite getting redder and more painful even though I have been taking Augmentin and Ultracet for three days?