I was stung on my upper arm, just below my armpit yesterday evening. Initially it was painful and there was a raised white lump by bedtime it still hurt but the lump had gone.
This morning I’ve woken up and my arm aches and there’s redness running down my arm towards my elbow. I’m going to call into the local pharmacy after I do the school run but wondering if this anything to be concerned about? The first photo is the initial bite. I’ve no idea what insect it was as just felt the sting.