A Brazilian man 31 hours after having been bitten on his face by a recluse<unk>  4 months after a brown recluse<unk>  with scar remaining Almost all<unk> s are venomous, but not all<unk> s result in the injection of venom. Pain from non-venomous bites, so-called "dry bites", typically lasts for 5 to 60 minutes while pain from envenomating<unk> s may last for longer than 24 hours. Bleeding also may occur with a bite. Signs of a bacterial infection due to a<unk>  occur infrequently (0.9%). A study of 750 definite<unk> s in Australia indicated that 6% of<unk> s cause significant effects, the vast majority of these being redback<unk> s causing significant pain lasting more than 24 hours. Activation of the sympathetic nervous system can lead to sweating, high blood pressure and gooseflesh. Most recluse<unk> s are minor with little or no necrosis. However, a small number of bites produce necrotic skin lesions. First pain and tenderness at the site begin. The redness changes over two to three days to a bluish sinking patch of dead skin—the hallmark of necrosis. The wound heals slowly over months but usually completely. Rarely, bites may cause widespread symptoms, with occasional fatalities. There are a few<unk> s that can bite human skin and cause a skin reaction, but<unk> s are blamed for many more reactions. In particular the misdiagnosis of infections and other skin ailments are commonly attributed to brown recluses. +<unk> s associated with skin reactions Scientific name Common name Venom Reaction Lampona spp White-tailed Welt Loxosceles spp Brown recluse Sphingomyelinase Necrosis Cheiracanthium spp Sac Lipase Redness Tegenaria agrestis Hobo Redness Lycosidae spp Wolf Redness, itching
Spider bite
Dog bite
Cat bite
Animal bite
Centipede bite
Nail biting
Snakebite
Needlestick injury