i'm a 17-year-old girl and ever since puberty started i have had this armpit rash. it's sort of on and off and recently it has gotten worse. it looks like little red pimples all over, except not so much where i would put deodorant, more around that area. sometimes the pimples get white heads and hurt a lot. it hurts in general. i don't think it's from shaving, or deodorant but i'm really not sure. wearing a bra really hurts because the end of the wire pushes against the rash. it doesn't itch at all. i have very sensitive skin. i don't know what to do. my mom doesn't think it's a problem and won't take me to the dermo...but i am so sick of it. any suggestions will be GREATLY appreciated!