Is swimming in the ocean good for poison oak?

No, swimming in the ocean will not cure poison oak. Poison oak is a skin rash caused by an allergic reaction to urushiol, an oil found in the plants of the Toxicodendron genus. Swimming in the ocean may provide temporary relief from the itching and discomfort of poison oak, but it will not cure the rash or prevent it from spreading. To treat poison oak, it is important to wash the affected area with soap and water as soon as possible after contact with the plant, and to apply a calamine lotion or hydrocortisone cream to help relieve the itching and inflammation. If the rash is severe, it may be necessary to see a doctor for prescription medication.