This is called acne and is normal during this time when your hormone levels are high. Almost all teenage boys get acne at one time or another. Whether your case is mild or severe, there are things you can do to keep it under control. Your penis and testes will get larger. You may have erections more often due to an increase in sex hormones.
Erections occur when the penis gets stiff and hard - sometimes for no reason.
This is normal. Even though you may feel embarrassed, try to remember that most people will not even notice your erection unless you draw attention to it. It is important to remember that the size of a man's penis has nothing to do with his manliness or sexual functioning. Your body will also begin to produce sperm during puberty. This means that during an erection, you may also experience ejaculation.