I've been bitten by them. I didn't have the large areas of flesh ulcerations (that only occurs in a small %). I did go through a 24 hour period of reaction to the venom thatfelt like I have the flu and fever but I didn't really run a high temperature. I was told that was my body fighting the venom.
I got bit by something and was out of it for three days with a high fever. My face was so swollen I couldn't open my eyes. Then after the symptoms went away, my face peeled like I had gotten a bad sunburn. Never found a bite area. The Dr. didn't even know what it was.