What disease is it when small blisters appear on the glans penis?

Patient's question:

Patient Age: 23
Detailed Condition and Purpose of Consultation: I have several small blisters on my penis. They don't itch or hurt. My thighs, inner thighs, and upper body are very itchy. What could this symptom be? Have I contracted a sexually transmitted disease?
Duration of Onset and Duration: One week
Current General Condition: My thighs, inner thighs, and upper body are very itchy.
First Follow-up Question: What should I pay attention to now? Is this condition serious? Is it contagious? Can it be cured?

Doctor's answer:

The inner thigh may be eczema, and the small white spots on the glans are pearly papules, which are benign and not contagious. They are mainly caused by poor hygiene and bacterial growth, and they will not disappear on their own. They can be removed with laser treatment, or left untreated. Most cases are caused by a dirty and moist lower body environment, and phimosis.
For eczema, you can apply external medications like Pramesone or Dermapin. It's important to change underwear frequently, bathe regularly, and clean the lower body daily with warm water. Avoid using soap or shower gel. Keep it dry.

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