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').
Methemoglobinemia can occur when a person is exposed to certain drugs or chemicals such as nitrites. Methylene blue injection is used to treat methemoglobinemia. This medicine works by converting methemoglobin to a more efficient type of hemoglobin to better carry oxygen throughout the body. Methylene blue may also be used for purposes not listed in this medication guide.