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.
Leaf Diseases. Fungal diseases from various pathogens cause leaf spots, blotches and blisters on birch trees. Cylindrosporium and Septoria cause small spots with no borders and Colletotrichum causes larger brown spots with darker borders. Anthracnose diseases, caused by Marssonina and Discula pathogens, form angular blotches instead of round spots.