Can you get an infection if your has bad hygiene?

Yes. If you let the smegma build up it will spoil and it can irritate your glans (the head of your , under the foreskin). This condition is called balanitis, and is quite painful. When you're little and the foreskin doesn't retract, there's no problem with this, because the smegma isn't exposed to air and bacteria; but as soon as you're old enough for the foreskin to peel back occasionally, you need to wash it once a day. If you're sensitive to soap, you can just use water to get the job done. After you wash your , make sure all the soap is gone if you used it, dry your , and fold the skin back down over the end.