I totally do this! I believe this is due to blood pooling. Especially when warm the blood vessels open up rather than constrict (with POTS the blood vessels already don’t constrict very well) so the blood then pools in those areas away from your head. I have to wear compression socks daily to help with this although obviously you can’t wear them in the shower which is a bummer.

Thanks for the info!

My veins don’t ever seem to change but blood pooling is super common with POTS. When I take a shower it’s the worst but hot weather overall seems to make POTS symptoms worse.

This is called Raynaud’s syndrome and people with POTS (including me) often have it. It’s totally harmless so I wouldn’t worry too much about it if I were you :)