Odd skin thing.

[Treaclewell]

Its popped up today on my inner lower right arm. A roughly circular slightly raised slightly sensitive lesion. That's how I found it. Went to scratch. About two inches across. It feels slightly spongy with a more resistant part in the middle. Slightly pinker than my skin is usually. I thought it might be an insect bite, but there's no puncture mark (I've used a magnifying glass!). I haven't been out much. Yesterday I drove a friend out, but I only got out of the car very briefly to get something from the back seat. Sat around for a bit in a rural environment with the windows open. There's no animal in the house. The bedding hasn't been anywhere to get bed bugs.
Any ideas? I'm going to take Benadryl because it looks like a histamine reaction.

ringworm? Can you post a photo?

Not ringworm, I had that a long time back in my teens, from a hotel bath mat. Lots of areas and took ages to go. Each lesion started small and spread out, fairy ring wise. This started the size it is. And I haven't been near alien stuff it could have had had spores on. There is a suggestion of a new patch at the edge though.
Really not sure how to post a photo. It's better today. It's not quite like the Lyme disease rash, thank goodness, and I really think I would have noticed a tick, and I haven't been out where there would be ticks. I see that it could have been days ago. And my housemate does go out in woods. Still think I would have noticed a tick sitting there guzzling.
When I get my phone running I'll take a pic. It may need e-consult at the GPs. and I'll need a pic for that.

Charger not properly in.
And the bugger has spread this morning while writing, doubled in size! My brain has fished up something from the health module at college, which one pupil's mother called inbertigo. It is not impetigo. Or scabies. Or anything else from the poorer parts of the borough in the 1950s. The child wasn't in the 1950s, but the living conditions were.

A hive?

I posted to 111 and by the time a nurse rang me the charming thing was almost gone, I had to apologise for hypochondra, It's still just visible, the centre part, anyway, without itching. It's continued improving without antihistamine, so not hive. Sorry to have bothered you all. Some weird passing insect I suppose, with very fine proboscis.