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 condition causes flaky, itchy skin on the scalp and can occur behind the ears. According to the Merck Manuals, dermatitis causes an itchy, often red, rash sometimes accompanied by blisters, swelling and often oozing, scabbing and scaling. Ringworm can affect the skin behind the ears.