What is the correlation between allergies and alopecia areata?

Autoimmune response. It is an autoimmune response against the hair that stops to from growing. Similar but not identical changes can occur in the skin, lungs, eye. There is no specific allergen in alopecia aerate.
Correlation. Alopecia areata is thought to be an autoimmune condition. Allergies are usually not autoimmune but are rather triggered by an allergen or an irritant.

Related Questions

Does alopecia areata have anything to do with asthma or allergies?

Not specifically. Asthma and allergies are what are called atopic diseases which are hypersensitivity reactions in various parts of the body (asthma - lungs, allergies - mucosal membranes) due to various triggers like viruses, allergies, pollution, etc., whereas alopecia areata is an autoimmune disorder where the body's immune system attacks the hair follicles for reasons that are not clear. Read more...