question: I think I have been bitten by a spider on my arm, I have a fairly large lump there now, maybe half a golf ball size but at no stage has it hurt, it was VERY itchy initially but after not scratching it it has settled down.  In the last hour or so I have felt a bit clamy (although the weather here is very hot at the moment) I have been sweating a bit but my skin feels cold to touch?  I am allergic to Bullants, Jumping Jacks, Wasps and Bees but know what their sting feels like.  I didnt even feel whatever has bitten me this time?