Bullseye like mark around vein on foot.

en.wikipedia.org/wiki/Lyme_disease

I agree Tangerine for many things, but the point here is that if you've got the bullseye rash it's almost certainly a sign of something that need antibiotics asap.
It was the same with one of our dogs. I found a tick embedded above his eye which had probably been there for a few days. He became weak - the infection kills the red blood cells. Took him to the vet, antibiotic injection. The vet said he could die overnight, or recover completely. TG he recovered.
You can't delay with suspected tick infections.

Instead of making an appointment with the Dr, why not just pop along to local chemist shop and ask the Pharmacist? I often find this is a good way of getting a diagnosis for things if you think it's not worth bothering the Dr.

There used to be a TV advert saying "Ask your Pharmacist".

"Please get the bullseye rash checked as it is supposed to be one of the most telling clues that you may have been bitten by a tick."
Not just bitten by a tick, but bitten by one that is carrying the disease. Not all ticks are carriers of Lyme Disease.
Or pyroplasmosis which is the version that affects dogs.

I live in an area that's bad for ticks and, though they aren't usually out at this time, the weather has brought them out since January. You don't need to be on grass for them to appear. They can be brought in on someone else's clothes and the last one I had appeared above my bra line and could only have got there by hanging off a tree and diving down my collar. Please get the bullseye rash checked as it is supposed to be one of the most telling clues that you may have been bitten by a tick.

Biting spiders False Widows have been in the news for a while, very nasty! Anyway Janet hope you are okay now.

Biting spiders have featured quite a lot recently in the press.

Thank you Janet. I hope you are ok. I can now warn my son who has recently moved to a rural area in France where there are deer.
But biting spiders! I've never heard of them. Ughh!!

Dear DammitJanet,
I'm glad that your rash has gone away. The fact that you posted meant that you were concerned about it. I appreciate that you posted because I learned more about tick bites. We live in deer country and I plan on taking more precautions this spring and summer to help prevent getting bitten.
Thanks to all who gave you supportive posts.

Hoping all is well with you now.
I just wanted to add that the bulls eye rash is a warning, and if it is from a tick antibiotic treatment must be started asap.
If ignored, a delayed response of very debilitating symptoms.
I found ticks nearly every day on our dogs, when we lived in France, and about once a week on myself. Once I felt itches on my back, checked myself in the mirror and saw 7 baby ones hooking in
As long as you remove them within ?24 hours they can't pass on their venom which they get from infected animals, mostly deer. We just used finger nails to pull them off, then put them on the fire.

The bullseye rash appears up to 30 days after being bitten, I have not been in any grass at all for a few months,but thank you.

Thank you everyone who has taking time to reply, much appreciated.

I would go to the Doctor:
www.nice.org.uk/news/article/diagnose-lyme-disease-if-bull-s-eye-rash-is-present-says-nice?utm_medium=email&utm_source=nicenewsletter&utm_campaign=lymediseaseqs2019

I don't think you wasted any ones time , it would be a shame if everyone just worried alone . Surely it is better to seek reassurances , and we are happy that is all is well in this instance xxx

I agree momb.
At least the thread has raised awareness of the danger from tick bites.

Why do people have to be rude? I despair! Glad the lesion, whatever it was, has settled down.

@Anja I didn't know it was a bite when I posted the first time.

Just to add, my concern was not that it was a tick bite (because I know it isn't) but that it was some kind of collasping/clotting/varicose vein until the puncture marks and the obvious bite showed up.

But, next time perhaps you could include salient facts, such as your house is overrun by biting spiders, whatever they are ?

@Esspee: I posted before I had taken advice from the NHS, and, with respect, you cannot see or feel the bite whereas I can.

You also are not aware of where I have walked, the likelihood of puncture wounds and a bite mark appearing months after I have been in any grass - I don't even have a garden - is nil.

I apologise for upsetting you by posting before I had given it rational thought as well as taken advice, I thought that was partly the reason for asking stuff on forums I can only suggest that you scroll past in future.

Thank you again to those who did post constructive replies and links, it helped.

A constant supply of biting spiders??? My advice would be to move out!

Threads like this always amuse me. "Gransnetters I need your advice." Everyone piles on giving the same advice then OP ignores it.
Please don't waste our time!

I havn't been in any grass or parks for months but i do have a constant supply of biting spiders in my home. The mark has pretty much disappeared now, just some very faint bruising left and it only appeared on Sunday so there's nothing left for anyone to see.

Thank you all again for replying.

Lyme disease is a possibility as has been discussed. Urgent GP appointment methinks.

Please go straight to your GP. I had exactly this with the bulls eye and two puncture marks. I was put on a strong anti biotic as a precaution against Lyme disease or an infection.
Do not take the wait and see approach.

Yes do get it checked out Dammitjanet We have a lot of ticks here and they do cause problems.. Drs are not very aware of the seriousness of Lymes disease it seems.