What are the blisters on the glans penis?

Patient's question:

Detailed medical condition and consultation purpose: About half a month ago, I developed some blisters on my glans, and I took acyclovir and virazole orally, applied acyclovir ointment externally, and it later healed. Unexpectedly, blisters appeared again on my coronal sulcus a few days ago. How can I treat them? Thank you!
Duration and course of the current illness: 3 days so far
Current general condition: Currently subsiding
Medical history: About half a month ago, I developed some blisters on my glans, and I took acyclovir and virazole orally, applied acyclovir ointment externally, and it later healed
Previous diagnoses, treatments, and outcomes: I took acyclovir

Doctor's answer:

Hello, considering the situation, it is likely balanoposthitis. Do you have phimosis? If a man has phimosis or excessive prepuce, the secretions of the sebaceous glands in the prepuce cannot be expelled and gradually form foul-smelling preputial smegma. Preputial smegma is suitable for bacterial growth, so it can cause inflammation of the glans penis and prepuce. The symptoms include itching, stinging pain, redness, swelling, red spots, and papules. It is important to get a timely examination to clarify the diagnosis and receive targeted treatment. Do not blindly use medication to treat it, as this may worsen the condition. Avoid spicy and irritating foods, smoking, and alcohol, and pay attention to hygiene of the genital area. If a man has phimosis or excessive prepuce, he should undergo circumcision in a timely manner. If there is inflammation, it should be resolved first.

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