my first husband suffered, for a time, with a condition similar to the wartime 'jeep drivers disease'. It had to do with bouncing up and down in the driving seat of the plant he was driving all day over rough terrain, getting hot and sweaty, and the sweat running down to you-know-where, and the friction of his underpants against his skin, with the sweat and dirt that accumulated, broke the tissues down, resulting in a painful ulcer-like sore.
He eventually went to the doc, who gave him some antibiotics as I recall, but the main treatment was to keep the area clean and dry. To this end he had to lie face down on the bed and allow me to apply whatever the doc had prescribed to that place, and then I had to sticky-tape a fluff-ball of cotton-wool to him to act as sort of protecting pad - I do wish I had taken a photo of him with his bunny tail, but at the time one needed to keep a straight face to preserve his dignity
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