Following measures are likely to be effective;
1) Hydrocortisone 0.5% cream, available over the counter. Apply twice a day.
2) Avoidance of vigorous masturbation.
Betadine is anti bacterial cream. Since your problem is reinjuring it before the healing is complete; a strong healing would prevent the recurrence of problem; which may take almost 6-8 weeks. So while masturbating, take caution, that microtrauma is avoided.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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