I have small itchy bumps all over my skin. When I squeeze them, a clear fluid leaks and the itchiness subsides. However, they can leak fluid for hours first. Other places of my skin itch without bumps. This has been going on for several months and is relentless.
They're hives and the result of an allergic reaction. It can be serious if they cover a large area of your body. If it persists, you should see a doctor and discuss whether you should get allergy tested. Personally, I have a skin condition that makes this occur every time I go outside in the cold. Take anti-histamines and monitor what you are exposed to when this happens.