How do I email a skin care specialist about my acne and extensive sweating?

My mom won't take me to the dermatologist, even though i've asked her thousands of times. She says it's just being a teenager, but it's sooo embarrassing!

I have acne that's like crazy. It's not all over my face, but I always have 2 or 3 pimples on my face, and almost all the time one is infected. And I always have scars from popping. I am 13 and I know this may seem normal, but I wash my face and use natures cure! (acne treatment) it sucks. How do I email someone about this to show my mom that I need to go? Oh and I used to Negev get bruises, but now I have a huge bruise on my chin and a small one on my nose.

And I sweat a lot. I don't remember the last time I didn't have a pit stain. I always have to wear layers or a hoodie because it gets so bad :( what do I do?! And yes, I wear antiperspirent deodorant :)