Skin change in penis glans last 4 months

I have noticed skin change in the penis glans since last 4 months, dark yellowish patch and a string like black lesion surrounding a skin change which I think is slowly spreading. I am also facing urine leakage since last 2 months 2-3 drops when relaxed and when there is no urine urge at that time there is a leakage of urine. But, I am able to hold back urine at that time there is no leakage. I also feel that previously I could hold back more quantity of urine for a longer period of time without any problem but now there is suddenly an urge to urinate at times. After getting up in the morning there is no or very less urge to urinate and very weak flow of urine but it gets better after drinking water. Previously I used to have a good flow of urine in the morning. Please guide me with the diagnosis and treatment. I have attached pictures. Urine routine and culture report is normal.