Hi ya, i have very sore armpits an my ribs around my side an tops of my breasts what would this be. thanks?

Armpit soreness: Armpit soreness is most often a skin irritation. Deodorants are the likely cause. A second common cause is sweat that becomes sticky and then creates clogged pores. Deodorants also cause clogged pores. I recommend you wash with antibacterial soap repeatedly. If redness is present or if a bump or abscess is present, you will need an exam.