What Causes Itchy Rash And Bumps?

I HAVE A CIRCULAR KIND OF OBLONG RASH ON MY UPPER CHEST. IT IS VERY VERY ITCH AND GETS LITTLE BUMPS AND SOMETIMES SHINY. IT BURNS AT TIMES. I ALSO HAVE IT OCCASIONALLY IN MY PUBIC HAIR .IT SEEMS IT GETS WORSE WHEN I GET HOT. IT FEELS LIKE THERE IS STICKERS IN IT. I HAVE SEEN A DR AND THEY PRESCRIBED A TOPICAL OINTMENT TO APPLY TWICE DAILY. IT NEVER REALLY GOES AWAY LONGER THAN A COUPLE WEEKS. I AM 40 YRS OLD AND HAVE HAD A TOTAL HYSTERECTOMY AND I WAS ON HORMONE MEDS BUT QUIT THOSE ALL TOGETHER. I HAVE BEEN DOCTORING FOR TOO MUCH BILE IN MY SYSTEM DUE TO NO GALLBLADDER. COULD THIS CAUSE THIS?