My father has joint pain, lower abdominal pain, insomnia, puffy eyes, and white spots on the skin. Why?

Hi doctor,

My dad, who is 56 years old, has white spots on his skin. He has a history of diabetes, and I would like to ask some questions about that. I have a signed authorization to speak to a doctor on his behalf since he struggles a lot with technology. The first question would be to know what that spot on his leg is, if there are any tests he needs to do and whether this may be linked to his diabetes. The spots appeared about a month ago. It was red in the beginning and itchy. He did get some medication for it, they are Etavone cream, Tacrolimus ointment, and Vitellus lotion, which helped with the redness and itching, but the white spot is still there. It is on his foot. I can provide pictures if needed. Further, he has a history of diabetes type 2. He has been experiencing joint pain, lower abdominal pain, lower back pain, insomnia, and puffy eyes. Five months ago, he did a blood panel and HbA1c, where it was noted that his iron levels were high. Another important thing is that he quit taking medication for diabetes about a year ago. He was prescribed a tablet of Glucophage-GP 1, Vitamin B12, and Vitamin D supplements most recently about one year ago and tablet Glycomet SR 500 for the first two years, before all these medications he was taking tablet Glucophage for about two years which did not help with symptoms as much as it should. His lifestyle is mostly sedentary. Please help.