Erosive blisters are herpes that rise above the skin and contain aqueous fluid. The blister walls may be thin or thick, and the contents are clear or turbid fluid that may occur singly or in clusters. Viral infections are the most common. Blister formation is mostly the result of inflammatory reactions such as those caused by bacteria, viruses, parasites (scabies), or metaplasia, and commonly includes aspergillosis, herpes-like dermatitis, and herpes zoster. Other etiologies such as basal cell liquefaction and basement membrane lesions, ballooning degeneration and reticular degeneration, necrotic epidermal loosening and epidermal peeling due to drugs and Staphylococcus aureus infection are seen in macrocancerous epidermolysis bullosa drug rash and Staphylococcus aureus scald-like syndrome.