vaginapagina | Sweating/skin problems/odd nipples ...

Hello, VP-ers! Just a few random questions, hopefully someone'll be able to help me!

Problem 1: My vulva [the folds between my vag and my thighs] sweats! Not terribly or constantly, it just gets quite annoying and a bit smelly, at least to me. I shave, so it's not like hair is holding anything in. I don't really work our or exercise, so it's not like sweating when you're doing physical things ... just when I take my underwear off at the end of the day, it's just ... sweaty. Any reasons/causes anyone can think of, and is there any way to prevent this?
Problem 2: I have started getting weird "bumps" in between my breasts and on my upper back. They're not like acne, they're just odd white bumps that don't go away. What is this? How can I prevent it?
Problem 3: My nipples are ... lumpy! Seriously, when I get cold or whatnot, my normally-smooth nipples get all bumpy/lumpy. They don't hurt or anything, it's just embarassing. Anyone else have this problem?

I think that's it. Sorry if I'm too vague, ask if you need anything clarified. Thanks so much for your help!