Ive noticed a white layer on the head of my penis, and it feels dry inside the foreskin. It also sticks when I try to pull it back. A few months ago, I had a fungal infection, but I think its healed. Could this be related to something else, like diabetes?

You may be experiencing a recurrence of a fungal infection. You can try using an antifungal cream like Clotrimazole 1% twice a day for 2 weeks. Make sure to keep the area clean and dry. As for diabetes, the presence of a fungal infection does not necessarily mean you have diabetes, but it is always a good idea to get your blood sugar levels checked by a healthcare provider to rule out any underlying conditions.