Any idea what this could be? It’s not sore of itchy. Bit of a hard lump in the centre. Looks slightly yellow in the middle. I noticed it a couple of evenings ago, wondering if it’s a bite of some sort. My cat caught and ate some sort of bug/spider (didn’t get a chance to see) in my bedroom the same evening I noticed it, I had changed my bedding earlier that day so maybe it was something in the duvet that big me when I was changing cover?
I’ve drew a line round the red part tonight and will check in the morning to make sure it doesn’t get bigger.