Any idea what this is?

[OutlandInland]

Posting for traffic. This appeared on my daughters face this morning. It's not pen even though it looks like it. It's under the skin. She's not aware of anything that she's done although it seems most likely that it's a blood blister. I wasn't planning on bothering the GP with it but just thought I'd post on here in case it's something I should be worried about? Thanks

No idea but I would get to the doctor.

Blue Nevus? I had one on my leg as a child, that grew quite large and had to have removed. I remember it being painful to touch as it had grown.

It's literally appeared overnight - could that happen with this? Thanks

I've no idea to be honest, I was only 9 when I had mine removed. I'd say definitely see a doctor about it though