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.
What diseases cause black spots on your skin? Quick Answer. Melanoma and seborrheic keratosis are two skin disorders that cause the appearance of dark or black spots. Melanoma is a form of skin cancer that is serious and can develop on any area of the body, as stated by the National Cancer Institute.