In people with diabetes mellitus, repeated infection, itching, and a tight foreskin are commonly due to balanitis and sometimes phimosis (tight foreskin), which tend to come back if blood sugar is not well controlled. High sugar levels make it easier for fungal and bacterial infections to grow, so the most important step for long-term relief is keeping your diabetes under good control through regular medication, diet, and monitoring. For the local problem, gently clean the area daily with water, dry it well, and avoid harsh soaps or chemicals. A doctor may prescribe antifungal or antibiotic creams, and these should be used for the full course even if symptoms improve early. If the foreskin is very tight or infections keep recurring despite proper care, a minor procedure like circumcision may be advised, which can provide a more permanent solution. Avoid self-medicating, keep the area dry, and consult a doctor early when symptoms appear to prevent worsening.