Various conditions can lead to irritated, red skin. Causes can range from a temporary sensitivity to a chronic skin problem. Common culprits of red skin or red spots include: 1  Dry skin. 2  Sunburn. 3  Rosacea. 4  Acne. 5  Allergic contact dermatitis. 6  Eczema (atopic dermatitis).
Methylene blue is a component of a frequently prescribed urinary analgesic/anti-infective/anti-spasmodic known as Prosed, a combination of drugs which also contains phenyl salicylate, benzoic acid, hyoscyamine sulfate, and methenamine (aka hexamethylenetetramine and not to be confused with 'methanamine').
â¢ Methylene blue (and oxidation product, Azure B) is a basic (alkaline pH) dye that stains acidic (acidic pH) structures blue. These structures are called Basophilic. â¢ Eosin is an acid (acidic pH) dye that stains basic (alkaline pH) structures pink/orange. These structures are called Eosinophilic.