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.
An uneven skin tone is most commonly caused by UV rays from the sun, however, age, hormonal changes, chemicals, and pollutants can also cause this condition. Additionally, the body itself too can cause uneven skin tones and blotchy skin by attacking the cells that produce melanin.