IgA deficiency, a selective lack of immunoglobulin A (IgA). The most common type of immunoglobulin deficiency, it occurs in about 1 in 400 individuals. IgA is a major antibody in the saliva and in the mucous membranes of the intestines and the bronchi. It protects against bacterial and viral infections.gA deficiency, a selective lack of immunoglobulin A (IgA). The most common type of immunoglobulin deficiency, it occurs in about 1 in 400 individuals. IgA is a major antibody in the saliva and in the mucous membranes of the intestines and the bronchi. It protects against bacterial and viral infections.
Pityriasis rubra pilaris (PRP) refers to a group of skin conditions that cause constant inflammation and scaling of the skin. People with PRP have reddish, scaly patches that may occur everywhere on the body, or only on certain areas.
Pityriasis versicolor is a fungal infection of the skin and is caused by a type of yeast that naturally lives on your skin. It's also sometimes called tinea versicolor.When the yeast grows out of control, the skin disease, which appears as a rash, is the result.This picture shows pityriasis versicolor on the chest of a child.t's also sometimes called tinea versicolor. When the yeast grows out of control, the skin disease, which appears as a rash, is the result. This picture shows pityriasis versicolor on the chest of a child.