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 can occur in two forms: acute and chronic, but there is an overlap between them. The acute form is called: PLEVA which is Pityriasis Lichenoides et Varioliformis Acuta also known as Mucha-Habermann's disease.The chronic form is called Pityriasis Lichenoides Chronica.They are mild forms of lymphocytic vasculitis.he exact causes of PLEVA and PLC are not known. They are definitely not caused by a fungus or bacterial infection, and they are not caused by anything that a person has eaten. They are also not due to any known type of allergic reaction. A virus is the most likely cause.