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 lichenoides et varioliformis acuta. An immune disorder of acute onset, which is more common in young men and characterised by successive waves of maculopapular, erythematous eruptions on the anterior trunk and flexor surfaces of the proximal parts of the extremities.ityriasis lichenoides et varioliformis acuta. An immune disorder of acute onset, which is more common in young men and characterised by successive waves of maculopapular, erythematous eruptions on the anterior trunk and flexor surfaces of the proximal parts of the extremities.