Recently Went On Vacation To Hawaii. A Week After Returning,

Recently went on vacation to Hawaii. A week after returning, my husband noticed red spots that resembled freckle on his legs. Also a rash on his upper right buttock. The spots became bright red for a day then slowly began to fade. Rash also went away. After 5 days, the same symptons reappeared. Urgent care sent him to a dermatologist for possible skin issues but after 3 separate health facility visits, no one can help. Today, new issue of abdominal tenderness and swollen ankles.