Smegma is a kind of natural ointment, lubricating the sensitive skin of the genitals. The production increases during puberty.
At first it is white and without odour, but after a few days it turns grey/green and becomes foul- smelling. This cheese-like substance becomes a breeding ground for infections.
Guys should pull back their foreskin every day to clean the glans and the rim around it thoroughly, removing all the white stuff. Pay attention to the pocket between foreskin and glans. If you use soap, rinse it off with lots of water, preventing skin irritation.
Girls have to pull the inner lips apart, making it possible to clean the area in between. Also wash around the clitoris, pulling back the clitoral hood. Never use soap, for this will disturb the vaginal flora, causing infections.

It hurts when I try to clean the tip of my penis. I am not circumcised. What should I do?
There is white stuff on my glans. It seems my foreskin is stuck to it. How can I solve this problem?
Every day there is white stuff coming out of my vagina. Is this normal?

If you cannot pull back your foreskin, see: tight foreskin