My mother was British, and I've never heard of that tradition. If the Scots had done it, odds are greater she would have said something disparaging. I searched on "Weird Birthday Traditions" just to add something to the thread, and the AI summary gave the example of Canadians doing the butter on the nose thing. So does India.
In other countries (like Denmark and Spain), they tug on your ear, once for each year of age. (30 years old = 30 ear tugs.) In Argentina, a bunch of people grab your ear and simultaneously pull as they sing you a birthday song. Other countries have some variation on the ear-tugging thing. It all reminds me of Carol Burnett.
I don't recall any friends doing odd things for their birthdays. That includes a Peruvian friend who put an egg under her pillow when she and her husband were trying to conceive. The only different thing was when she had written her birthday down using the International date standard of Day/Month/Year, so on November 4 they threw her a true surprise party...her birthday was April 11.