I was bitten by a spider on Friday at work, I unfortunately I don’t know what type of spider , it has caused swelling and blisters on my forearm, it started turning black and went to the emergency room where they gave me a TTA 0,5ml injection and have prescribed me augmaxcil 625 and fucidin ointment S4 it started with a red line going under my armpit but somehow today I see two, I have a swollen gland under my armpit and a burning feeling and tight skin , when I apply the fucidin it goes red and the blisters are smaller now but there are more what should I do .