I am a 52 year old woman who had an excision of cyst on the upper part of my back 4 years ago, my doctor left the site open and not stitched. Few months after that, a keloid was then developed. A year after the keloid has come out, i have noticed and smelled a foul smelling thing on my back which i believe is coming from the said keloid. i am wondering, what could this be? i have always kept my back and keloid dried and clean as possible, and yet the foul smelling still remains.