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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.Redness of penis with swelling and sensitivity can be from inflammation or infection of the skin of the penis.It can be due to a bacterial or fungal infection.If the other area of the skin is red, it can be diaper rash.Allergy to soap, lotion can cause it. Neosporin cream can help in mild bacterial infection.In mild cases, it would subside with those measures.Lamisil cream can help in fungal infection.If you notice the swelling, redness is increasing, I would advise to take an examination by doctor.I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish his healthy life.Regards.