I inspected it earlier and seemed to be nothing on it but I’ll check again when I’m blanketing her tonight thank you!My old highland had a similar lump. It was a tick but he had knocked or bitten the body off and left the head in side the lump. I squeezed quite hard and the head, luckily came out. Put some iodine in the hole and it healed beautifully.
Just over night I have her without a blanket because it’s quiet warm during the day thanks a lot I was worrying myself!How quickly has it appeared, overnight? If so it's likely to be an insect bite or possibly a thorn?. .