How To Prevent Pilonidal Sinus?

I just had surgery on a pilonidal sinus. I've had the sinus recur about a dozen times and had been given an acid cream. Just recently I was told what the condition is and surgery was recommended. I'm a bit horrified at this now that I know more about it. I'm eager to prevent future flareups. I have very very little body hair. My mother, however, had a cyst under her arm (treated with radiation) and I too have had one of those (healed on its own). I've gathered I may have inherited this condition (I'm 54 years of age, of normal weight and am very fit but have experienced the cysts for about 10 years). I need super explicit advice about how to avoid these, especially since I have a desk job and I watch tv in the evenings quite often. What specific postures are best? Is getting up every half hour or hour (at the office) enough? And regarding cleanliness, I shower every day but should I use alcohol clean wipes or what else on this area? It appears at some websites that soap is not the best thing though I rinse thoroughly. Are snug (not tight) jeans a problem? Should I discard all nylon underwear? Is sitting on the small of my back (vs my tailbone) on the couch with my legs on an ottoman just as bad for putting pressure on this area? Many thanks. H