But the hand of Yahweh was heavy on them of Ashdod, and he destroyed them, and struck them with tumors, even Ashdod and the borders of it.
The tumors that broke out on the people were often in the armpits, the groins, etc.   Psalms 78:66 has this in the KJV, "He smote his enemies in the hinder parts."  Keil interpreted this to mean that, "He smote them with boils on the anus."[24]  The Vulgate here reads, "He smote them in the more secret parts of their posteriors."[25]