I've had this rough patch of darkened skin on my upper back for at least 6 months. It does not hurt and is never itchy, however it is rough to touch and has appeared to have gotten larger. I am thinking melanoma. Any thoughts?
Yes, go to a doctor!
Yup, go to the doctor.
There are all kinds of different conditions, skin cancers etc. My advice would be to seek your GP's opinion. If they are concerned they will refer you on a 2 week wait to the local plastic surgery team. They can then tell you what it is or do a biopsy to find out.