O26.40

Clinical Causes: Herpes gestationis is believed to be an autoimmune disorder where the body's immune system mistakenly attacks skin proteins, leading to blister formation. The precise cause remains unknown, but hormonal changes during pregnancy can influence immune system activity. A genetic predisposition may increase susceptibility, although specific genes have not been definitively identified. It is not contagious and cannot be passed from mother to baby through contact.

Key Symptoms: Initial signs often include intensely itchy, red, and hive-like swelling on the skin. Blisters or vesicles may develop, often appearing in clusters and being fluid-filled. The rash commonly appears around the abdomen, especially near the navel, but can spread to the breasts, buttocks, thighs, arms, or legs. The skin may become sore or cracked if blisters burst. In some cases, mild symptoms may be initially mistaken for other skin conditions like eczema or dermatitis. Pregnancy may experience flare-ups and remission phases, with symptoms varying in intensity over time.

Diagnosis Path: Medical history review and physical examination focusing on skin lesions. Skin biopsy of affected areas to identify characteristic immune deposits and to differentiate from other blistering skin diseases. Direct immunofluorescence testing of skin tissue to detect immunoglobulin G (IgG) and complement deposits along the basement membrane zone. Blood tests measuring levels of certain antibodies that target skin components, which may support diagnosis but are not always definitive.

Treatment Protocols: Topical corticosteroids help reduce inflammation and control itching. Systemic corticosteroids, such as prednisone, are commonly prescribed for more severe cases to suppress immune activity. Antihistamines may be used to alleviate itching, improving comfort for the patient. Close monitoring throughout pregnancy to observe for flare-ups or worsening symptoms. In some instances, immunosuppressive therapies are considered, but options are carefully weighed against potential risks to the fetus. Postpartum management might involve tapering medications as symptoms decrease after delivery. Good skincare practices, including gentle cleansing and avoiding skin irritants, support symptom control.