It is not clear in your question how the hole is closing or what you're actually describing. I'll have to assume that you're talking about the urethra. Chronic inflammation of the penis’s gland (balanitis) can cause strictures of the urethra’s opening. Tumors that grow near the urethra’s opening can also cause the urethra to close. Treatment of such conditions is usually surgical. You can definitely consult a urologist about this condition and seek diagnosis and treatment.