Large single spot on penis shaft

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I had a smaller spot just like this in the exact same place a few months ago. Its very sensitive when touched, not irritating or painful otherwise

There are two ways of dealing with this: get some liquid antiseptic and dab directly onto the spot 4 or 5 times a day. When it starts to reduce in size apply the antiseptic 2 or 3 times a day, then 1 or 2 times a day when it has almost healed.
Or, you can go to a doctor who carries out minor surgical procedures and they will deal with this for you …