So I pulled a weed from behind a rose bush and snapped a thorn off from a stem which had embedded in the inside of arm above elbow.
It was a fair sized curved thorn and I had to curve it out of the little wound.
I ran the spot under the tap. Then I forgot about it.
Today it's got a red/purple ring around it and it's painful just resting against my body. When I move my arm I can feel it catching. It was 5p size this morning and now 50p size.
Is it a watch and wait?