I see a white layer on my penis head and it feels dry inside foreskin and it sticks wen I try to pull it back.. I had fungal infection few months ago.. I think it git cured.. And does this mean I hav 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.