<s>[INST] I was bitten by a black widow about 2 weeks ago on my forarm.  The bite swelled up and I have a bruise about 3 inch radius around th bite.  The bruise is still pretty big and the spot where the spider bit me is sore and has a hard lump. But the bump area did not bruise.  How long does it take to heal?   Is this normal for a spider bit?  I was put on anitbiotics for 10 days, which was up yesterday. [/INST] Hi,In general, the bruise you're mentioning is a localised reaction to the toxins of the bite. It should be resolved itself in a few days time.However be a little cautious about it, sometimes secondary localised infection can occur at the site.If you feel something like the bruise is containing pus or is leaking liquid, should consult your GP for incision and drainage of the wound.In most probability, it should heal by itself.Get well soon. </s>