Correction: it's pruritus not puritas
It can be related to uncontrolled diabetes. It can be related to age and puritas [dry skin] too. As we age our skin tends to dry out. If your itch dissipates after applying anything moist [lotion, cream, moist towel] to the skin, it's probably puritas, especially now as we enter our dry winter season. If so, go see a Dermatogist for he/she can Rx a topical cream that will relieve the itching, then you finish the job by applying a moisturizing cream, not lotion. If not, you need to provide us with information on how you are controlling and managing your diabetes - weight, exercise, nutrition plan, daily test results, last A1c result, and so on.