Hello, I found this spider in my bedroom before and recently l have appeared to have been bitten, my stomach had a couple of bites on it and the area was swollen and tender and hurt quite a bit! It may not have been this spider that bit me but i'd still like to know what it is as i've never seen anything like it before.
I have tweaked the image a little and inserted below. This is Steatoda nobilis, one of our six species of False Widow spider, and by far the most notorious species. It can bite and is more commonly reported as doing so, although this is still a rare event. Females, as this appears to be, pretty much stay in their webs and rarely move to new positions unless disturbed or their catch of prey is poor. Males on the other hand leave their webs when mature (late autumn to spring) and these are more likely to find themselves in a position to bite through wandering into some daft places. They will bite only when trapped between skin and clothing or handled roughly. Like a few other species of spider that are found around our homes form time to time they occasionally find their way in between bed sheets/duvets and will bite if rolled or sat on. Has to be said that they are usually worse off and come the morning a squashed spider is usually all that remains. It is possible that you have been bitten by this species of spider as where there is one there are usually many more.