My ears seem to get all of lumps and spots i get them on and behind my earlobes i do wear headphones alot in my job so maybe sweat gets trapped or something, what could it be?

You probably should get a medical person to examine you because sweat traps would not cause lumps on the earlobes.

Headphones worn over the ear can cause an acne flareup and an increased risk of skin infection , esp if they are worn for long periods and after a workout.Your hair follicles can be blocked by dirt and bacteria. You could also get an allergic rash . So it is important not to let excess oil and grime accumulate over the ears , by keeping the area clean, using a ph balanced cleanser.