I have one bump on the outside of my thigh. It just appeared overnight and when I popped it clear stuff came out. Its not itchy just sore?

Cyst or follicle. Sounds like you developed a cyst or inflamed follicle. These are common and not dangerous. Keep the area clean and try not to scratch or irritate it. See your doctor if it becomes red, painful and oozes pus. Usually these just clear up on their own.