What Causes Boils On Neck, Underarms And Nose?

height 6 ft,not allergic to any medicine,my age is 29 from last 2 to 3 yrs i am getting boils or you can say big pimples on underarms,neck & starting area of my nose.....i am not diabetic....also my doc suggest me med soap for bath and t-bact ointment to apply....also my doc told me its infection which u found in air.....pls reply as tablet i am taking is right or wrong