What is this brownish spot on my leg with hair growing out of it?

A brownish spot on your leg with hair growing out of it could be a benign skin condition like a mole or a skin tag. It might also be a condition called a dermatofibroma, which is typically harmless. However, any new or changing skin growth should be evaluated by a healthcare professional to rule out any concerns, particularly skin cancer. If you're unsure or if it changes in appearance, it's best to seek medical advice.