What Causes Bumps On Scalp After Sun Exposure?

Hi there! For two days i was in the sun hiking and i just woke up today after showering and resting and find that there are bumps on a part of my scalp that feel like scabs and when i press them i retract my fingers and have wet liquid on them. What could this be? Is it something to worry about or have i just burnt my scalp and it will go away?