A welt on my nose has a hard core that protrudes from the swollen area and when brushed against or washed or bumped with my glasses, feels like a loose scab. The swollen part, less than the circumference of a pencil, looks to be full of liquid, but I have not punctured or squeezed it. I am above 60y/o, and recognize it not to be a regular skin eruption, as a zit, black or white head.