Some kind of skin allergy. Please help

My father is 65 years old. He’s had some skin marks that look like ring worms for over a year now. I told him to go to the doctor but he doesn’t have insurance. He won’t go. He did say he went to a few doctors. Hey just give him creams that don’t work.  Please help me figure out what this is. They look like dark brown rash marks. I looked up ring worms. They look similar. How can I post a pic 

Concerning insurance, at 65 he would be eligible for Medicare to help cover costs.