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.
The most common cause of red blotches on skin is dermatitis, which is a broad term that describes various types of skin irritation. For example, dermatitis can be caused by harsh soaps, such as some dish and laundry soaps; environmental pollution, such as excessive dust; or by extreme weather conditions.