oh god please help

Im in an awful state. i had the doc check a mole on my arm and she referred me to a derm to have it checked to be on the safeside.

Now i have found this small red mark on the underside of my left boob.
Boyf says it is a mole but it looks like a burn mark and it defo wasnt there a few days ago cos ive been checking.

im in an awful state please help