Spiders that are venomous to humans and whose bites may cause blisters include the Brazilian wandering spider, Australian funnel-web spider, widow spider, false black widow, six-eyed sand spider, recluse spider, mouse spider, tarantula, yellow sac spider, hobo spider, white-tailed spider and sun spider. In some cases, blisters may be caused by the spider's venom, and in others, the damage is caused by the spider's jaws.Know More
Though nearly all spiders inject some sort of venom when they bite, very few of these toxins are considered medically significant to humans. Of those that are considered toxic, only the Brazilian wandering spider, the funnel web spiders, some of the widow spiders, the Chilean Recluse spider and the Chinese bird spider, which is a type of tarantula, have caused fatalities. The bites are much more dangerous to small children and the elderly. A non-fatal bite from these spiders is still likely to cause local tissue damage, however, possibly including blisters.
The other spiders listed may or may not cause tissue damage and blisters when they bite. Of these, the recluse spiders, particularly the brown recluse, are most notorious for causing tissue necrosis, but this problem actually only occurs in a small minority of recluse bites.
Blisters may also be caused indirectly by rubbing tissue that has been irritated by an otherwise harmless bite.Learn more about Zoology
Black and red fire ant bites commonly cause blisters and pustules that usually develop within a few days of initial contact, states WebMD. This is a normal reaction; in most cases, the blisters go away on their own. Normal reactions to most insect bites include redness, swelling, itching and pain. Swelling of more than one-third of the bite location can indicate a severe allergic reaction.Full Answer >
According to Mayo Clinic, spider bites are often itchy and produce a red, raised bump at the site of the bite. A spider bite should be cleaned using warm soapy water, and a cold ice pack can be applied to the area to reduce inflammation and pain.Full Answer >
Within hours, brown recluse spider bites may cause severe pain and swelling, blisters with a red ring and blue center, itchy rashes, ulcerations or pimple-like contusions with green or yellow pus, advises Drugs.com. Other symptoms include joint pain, dark urine, fever, nausea, vomiting, seizures or chills.Full Answer >
WebMD advises against popping or breaking blisters from spider bites or other causes. Instead, it is best to cover them loosely with a clean bandage or leave them uncovered. Additionally, it is important not to apply pressure to the blister.Full Answer >