question: Hello doctor, For the past few months, I have noticed a horizontal wrinkle on my glans penis all over and the glans is not as pink as before but slightly dark and blackish. I am worried that frequent dry masturbation is the reason behind the wrinkle. There is no blood, pain or discharge from it. The only thing is wrinkle which is very much visible when the penis is small but when the penis is enlarged, the wrinkle is very less visible. Also, I do not think it is a bacterial or a fungal infection because there is no symptom. Of note, my fasting blood sugar is 79.