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This is Dr. David
itching of the ball area sounds like a scrotal fungal jock itch infection
you should use over the counter antifungal sprays and powders for 2-4 weeks to see if this helps clear up the jock itch.
the soreness of the tip of the penis could be from irritation from wet bathing suit as well.
your symptoms don't sound like they are from STDs.
let me know if you have questions.