I've been swimming in a ocean for the past 3 days and when ever I go into the salt water my scrotum starts to burn I've also been getting small little red bumps all over my body that itch accept for where I had my swimsuit on?

Swimmers itch. You may have swimmers itch, an irritation caused by schistosomes in the water. Alternatively this could just be irritation or sensitivity to something else you have come in contact with. Treatment is usually avoidance , low to medium potency steroids topically. Usually last about a week.