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.
Quick Answer. Blister-like scabs in or near the armpit are commonly caused by conditions such as allergic contact dermatitis, psoriasis, yeast infection and skin tagging, according to WebMD. Since each of these conditions has a different underlying cause, they each require a different type of treatment. Continue Reading.