The possible causes of a chest rash include allergens, autoimmune disorders and infections, according to Healthgrades. Other factors, such as stress, can also cause a chest rash.
A chest rash is a condition that causes the skin on the chest to swell, redden and develop blotches, explains Healthgrades. It may also result in scaly spots that contain pus. Rashes may assume various patterns and magnitudes.
An allergen is a substance that causes an allergic reaction than can result in chest rashes, reports Healthgrades. Common allergens that may contribute to the condition include cosmetics, metals in jewelry, poison ivy and chemicals from industries. Food allergies, bee stings and eczema can also cause a chest rash.
Autoimmune disorders that cause chest rash include Kawasaki disease, which inflames the blood vessels and distorts the mucous membrane, says Healthgrades. Rheumatoid arthritis and systemic lupus erythematosus are also autoimmune disorders that trigger chest rash. While the former causes inflammation in the joints, the latter is a condition in which the body destroys its cells and tissues.
Infections such as shingles, erythema nodosum, lyme disease and impetigo are also possible causes of chest rash, states Healthgrades. Another infectious factor that leads to chest rash is meningitis, which is a condition that inflames the sac around the central nervous system. To avoid serious health problems associated with chest rash, the patient should seek immediate medical attention to cure the underlying infections.