brimstone - an old name for sulfur. native sulfur, native sulphur. atomic number 16, sulfur, sulphur, S - an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions)
These patches of red, and sometimes irritated or itchy, skin can appear anywhere on the body, but they are most commonly found on the arms, neck, and face. These blotchy patches can be caused by a variety of factors, such as weather, genetics, allergies, or environmental conditions.
A number of medical conditions may cause blisters. The most common are: 1  chickenpox â a childhood illness that causes itchy red spots. 2  cold sores â small blisters that develop on the lips or around the mouth, caused by a virus. 3  herpes â a sexually transmitted infection (STI) that most commonly affects the groin.