Please help. Arm and armpit. (Pictures)

🐬Katie🐬
Okay. I am self conscious, unfortunately. I have 2 things that make me not want to wear dresses and tank tops. 😔
My two questions:
1. What do you think this is?
2. How can I get rid of it? 
Please help me. ✨
This is my armpit. Excuse the stubble and mole. Lol. It is like this on both armpits. 
This is my arm. My other arm is just as bad.