What Is Most Likely To Cause Swelling?
Tick bites and bug bites can cause blisters but the most likely insect to cause a blister would be a bite from a spider. Brown Recluse spider bites are known to form a large purple irregularly shaped blister surrounded by a red ring. During the day preceding the bite, the blister opens and an ulcerated area forms. This looks like an infected crater forming at the bite.
What Should I Do Next?
If you suspect this bite, you should see your doctor immediately. This ulcerated area can continue to enlarge if not treated promptly by a physician. This brown spider has a dark-orange violin-shaped mark on its head and tends to live in dark, dry places such as vacation homes or abandoned houses. If possible, take the spider with you to your doctor or ER to help them with the diagnosis and medication.
Is This All Normal?
It is fairly common for insect bites to swell up a few hours after you have been bitten, this can be worsened by itching and scratching the bite or the area around it. Swollen bites can also ooze a clear fluid which is also worsened by scratching, particularly if scabs are formed and then scratched off. Bee and wasp stings are well known for swelling up and many people can be allergic to bee or wasp stings which intensifies the swelling.