I used to get these quite a lot and i too worried at first. After a while, i realised most of them were zits so i popped them lol gross i know. But, the point is, i went to see my doctor and he told me it was quite common in young guys but always better safe than sorry and advised me to always get them checked out if they are there for longer than a week. So i guess checking with your doctor is the best option for you.