The itchy and dirty glans may be caused by circumcision and glansitis, urethritis and allergic factors. 1. Circumcision and glansitis: men have long foreskin and do not pay attention to care, which can induce circumcision and glansitis, which will lead to glans itching and dirty, accompanied by glans redness, tingling and other symptoms. 2. Urethritis: men who have unclean sex may suffer from gonococcal or non-gonococcal urethritis, which causes frequent pus secretions at the urethral opening area and irritation of the glans, which will make the glans itchy and dirty, and is accompanied by frequent urination, urgency, and painful urination. 3. Allergic factors: for example, allergic to toiletries, so that the glans has an allergic reaction, and the allergy is more serious, will lead to the glans itchy and dirty. Itchy glans with dirt, may be the existence of abnormal conditions, it is recommended to consult a doctor as soon as possible for examination and treatment.