<s>[INST] 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? [/INST] Hi, thanks for using Chat Doctor Your symptoms are in keeping with an allergic response to whatever bit you. The inflammation due to the bite would cause the swelling and the increased sweating is due to the stimulation of a certain part of the nervous system by the allergic response. You should consider taking an oral anti histamineThese are available over the counter. Examples are Ben Chat Doctor. I hope this helps </s>