Peculiar Rash and Lesions - Need Help DERM

20-year-old male who is new to me with unknown history and is mentally challenged presents with a rash. He has not tried any medication for this. His caregiver states that they went to see a dermatologist who stated it was not psoriasis. I started him on betamethasone cream and derma-smooth for his scalp as he does have lesions on his scalp. What am I looking at here? Is this plaque psoriasis? Or is this a lichen disorder? Any help appreciated. Thanks in advance.

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