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.
1 Allergies to cosmetics such as lotions can also cause red spots to appear on the legs. 2  Infections-Infections on the skin can cause red blotches to appear on the skin. 3  These are frequently caused by a bacterial infection that is affecting the skin.