Diabetes, if not well controlled, may increase the probability of developing psoriasis. The causes of diabetes are not yet fully understood, and the causes may vary markedly from one type of diabetes to another. People with diabetes who do not normally control their blood glucose levels and have elevated blood glucose levels over time can have an impact on their health. Long-term poor control of blood sugar levels may be prone to co-infections, which in turn may increase the probability of developing psoriasis. Environmental factors play an important role in triggering and aggravating psoriasis. The factors that are most likely to promote or exacerbate psoriasis are infections, stress, stressful events, traumatic surgeries, pregnancy, obesity, alcoholism, smoking, and the effects of certain medications, among which infections are of great concern. Patients with diabetes mellitus are advised to keep their blood sugar levels under strict control. If clear red spots, papules, plaques, covered with silvery-white scales with itching appear on the skin, it is recommended to visit the dermatology department of the hospital to find out if it is related to psoriasis and to give the appropriate medication under the doctor’s guidance.