Noticed White Thick Deposit Under Foreskin. What Could Be This?
It sounds to me like something tha is called smegma. This looks like thick but soft deposit of white,smelly substance under the foreskin,especially at the bottom of your glans. This is often found in noncircumcised men and is nothing to be concerned about. All you need is proper and often cleaning. This is produced by penis glands and made of its secretions,death cells and bacterias. It isnt XXXXXXX but sometimes might be a place where bacterias can grow. You simply need to at least once a day pull your foreskin back until the whole glans is uncovered, and wash it with clean water and neutrla soap, and dry it well. At the beginning it might be necessary to rub this smegma a bit harder ,but you should clean it well and it wont come back then anymore. if you cant pull your foreskin completely you might have phymosis and you should visit doctor.
Secondly, if this cant be removed and you feel burning pain, have discharge or redness on your penis it might be STD or other genital infection. Especially if you are sexually active. In that case you should visit your GP for treatment.
Hope I have answered your query. If you have any further questions I will be happy to help"