What’s your diagnosis? It’s not herpes. Also, the patient is 55-years old. I’ll post the correct answer in a couple of days!
Correct answer: Grover’s disease. A skin condition of unknown etiology. The rash forms quite rapidly, especially when sweating (so advise the patient to keep cool). It mainly affects Caukasians above 50 years old. It will resolve spontaneously in 6 to 12 months.
I would like to add a few differentials 1) Atypical measles 2) Coxsackievirus infections 3) Poison ivy 4) Superficial pyoderma ( due to - scabies, bed bugs, impetigo, tinea ) 5) etc. ( end of thinking capacity ) :hhh: P.S : The etiology, is largely unclear, but there are some who believe that it may be a cutaneous manifestation of mercury poisoning. ref - Paul I Dantzig, MD with the Department of Dermatology at Columbia University School of Medicine, "Age-Related Macular Degeneration and Cutaneous Signs of Mercury Toxicity", Cutaneous and Ocular Toxicology, 24: 3-9, 2005.