I’ve noticed in the last few days maybe week that the skin around my underarms seems to be very dry. It’s almost like the outside of a tank top area from front to back. It’s also visibly darker like I have a tan but I’m in the Northeast and haven’t had a tank top on in months. Any thoughts on what this could be? I used a body scrub on it yesterday and lotion on it today. I haven’t changed soap, lotion, or deodorant recently. TIA!!