I Have A Rash That Started The End Of 2015

I have a rash that started the end of 2015 after I had a shingles vaccination. It started as a small red itchy place on my abdomen. It has now spread all across my stomach and under my breast and recently lower on my stomach and pelvic area. It is also on the back of my neck and between my fingers on my right hand only. One doctor said it is a rash and told me to use hydrocortisone cream and another doctor said it is a fungus and to use nystatin cream. I have used two tubes of nystatin cream and it still has not gone away.