You have been warned

Spotted in our local allotment. The one and only photo today.

Tried to get to the bottom of a strange rash I developed after orienteering in the Lakes. Concerned it might be Lyme Disease spread but ticks although I didn’t find any after my run. Fortunately no other symptoms of the disease so just a reaction to something. Have been asked to draw a felt tip line where it is to see if it tracking up or down my leg. Hopefully it will settle down soon.