A reader submitted this picture taken about 24 hours after she felt a burning sensation in her leg. The leg began swelling during the night.
The blisters formed the next morning.
The reader thought this may be a spider bite, but no mention of a spider being found. In many cases there is just no way to tell what caused a rash like this -- certainly not with only a picture.
If a rash is causing discomfort or seems to be expanding, it's important to see a doctor. It's also important to see a doctor if you have a fever. Whether it's a spider bite or not doesn't really matter, what matters is that a rash of unknown origin is diagnosed (if it can be) and treated promptly.
Any opinions expressed here are for educational purposes only and are not intended for diagnosis.
Have a spider bite you want to share? Submit a picture of your spider bite.
Want to talk about spider bites? Ask others and see more bites on the First Aid Forum.