We Just Came Back From Urgent Care , Husband Has

We just came back from urgent care , husband has a rash ALL over this back,chest,arms, Doctor said not shingles which he had 6 weeks ago. Said he was not sure but gave him steroids. Said something he must have come in contact with. No new medicine, or detergent or clothes. Going to dermotologist tomorrow, just wondering your thoughts.
thanks so much