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As far as I can tell, I can't find an answer to why that red ring or bullseye pattern appears, but I'm getting to know the culprits. Bullseye patterns appear from the bites of Arachnids. This family includes Spiders and ticks (as well as other buggy members that don't seem to leave that bullseye). I've seen bite from Brown Recluses, White Spiders, ticks of all flavors (including ticks that are and aren't Deer Ticks). Not all leave that bullseye every time they bite. FYI, bedbugs don't leave that bullseye.

As to Lyme's Disease, it's carried by ticks alright (mostly in the Deer Tick, in America's Northeast, although Northern California gets some as do some spots in Asia (different species here). So far, almost all cases of Lyme's Disease start with a tick bite that bullseyes. BUT -- not all bullseyes cause Lyme's Disease. In fact, Lyme's disease is pretty rare when compared to the huge number of arachnidae bites we all experience. I realize there's an episode of "House" where they identify Lyme's disease by finding the bullseye. But they only have an hour to amaze you, so they skip the fact that not all or even most bullseyes indicate something truly dangerous.

Infections from bites can occur, but the bullseye is NOT an infection sign.

As to treatment, mostly observation is the key. If nothing happens and it goes away -- great. If the patient starts spiking a high temperature, if the wound seeps or an open sore forms, if thread-like red lines appear, radiating from the wound, if it feels really hot to the touch after a day or two, if flu-like symptoms develop -- go to a doctor. If the patient starts having problems breathing, go to the ER instantly, or call for help. If none of these things happen, keep the wound clean and watch it heal.

I want to close with one last thought. There's a saying in diagnostic medicine that goes like this: "When you hear hoofbeats outside your window, don't go looking for Zebras". It means, look first for the common, likely answer, before you start looking for bizarre, rare or exotic diagnoses.

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10y ago
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11y ago

Inflammation usually presents as red swelling or as a red ring after any type of bite.

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Q: What causes a red ring after an insect sting?
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