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Thank you for your question, masturbation can cause ulcers because of the rubbing effect, these ulcers can simply be treated with stopping the masturbation and using oil over penile area to make it more soft, in most cases these are due to dry skin caused by too much rubbing. Let me know if you have questions, thank you.
Thank you for your reply, it is more of inflammed area and seems due to possible irritation or rubbing, other possible cause is wart. Try over the counter antiviral creams like Acylex which will help early healing.