After epsom salt bath - burn like lesions occurred on sensitive areas where sat on salt. how to treat pain and lesion ?

Try vaseline gauze: Applied after a cool soak to be sure all of the Epsom Salts are washed away. Epsom Salts (Magnesium sulfate) should always be dissolved thoroughly before bathing in it. If you have any skin wounds they would be irritated by the salt. Apply vaseline to any such areas before the bath. Only use Epsom Salts if you are treating some specific condition, like arthritis, not just as a water softener.