A 69-year-old male presents to his dermatologist with a painful rash above his right nipple as shown in the Figure. Which of the following is the most likely etiology of the patient\'s rash
:
1) Excessive fibrosis and collagen deposition
2) Superficial bacterial skin infection
3) Autoimmune IgG antibody against desmosomes
4) Virally mediated epidermal hyperplasia
5) Reactivation of latent virus
Diagnosis ?