Yellow Stuff When !!!?

When I There Is Yellow Stuff That Is Underneath My Foreskin. I Don't Know Whether This Is Linked To Me Not Being Able To Withdraw My Foreskin Or Not. Do You Think I Should See The Doctor Bout The Foreskin And The Yellow Stuff? However, I'm Not Sure Bout The Legalities Of The UK Doctors Prescription Whether You Have To Be A Certian Age, As I Am 17 (18 In Two Months)