lowering your sodium intake is the main thing to do for high blood pressure iirc. don't salt your food as much as usual and stay away from things like chips etc. if you eat a lot of instant ramen drop it asap because those stuffs have like 50% the recommended amount of daily sodium for an adult per cup i am not kidding it's ridiculous.
I have low blood pressure and my socks and stuff still leave imprints on me.It's nothing to do with blood pressure, they're just imprints left from hours of pressure the same way leaving your arm on the edge of a table leaves a mark for example.