Brown widows are devious brown and yellow/grey spiders that like to hide in places where people are usually around. There may be many of them, but they are less poisonous than the black ones and way less likely to attack.
One of the brown widows eggs can hatch hundreds of babies, which means if you don't kill one of their egg sacs you're letting them populate even more of San Diego. The way you can tell it's a brown widows egg is if it has spikes.
We still are not sure where the spiders came from, but most people think they came from Africa. The scientific name for them is latrodectus geometricus.
If you are big by a brown widow you should rush to the hospital to avoid the pain becoming severe, but in most cases they only cause minor problems. On the other hand, If you get bit by a brown recluse widow you better rush like crazy to the damn hospital.