What Causes Soreness In Back And Chest?

A couple of days ago, I started getting really sore in my back area, around where my bra strap rests... SORE like someone beat me up... bruises... and it just got more tender as time went by.Today, it has spread to my chest and my breasts.. its like a body full of bruises, skin very tender to the touch ... almost can t stand to put on a bra... can t sleep on my back at night it s just so sore...???