L43.9

Clinical Causes: Autoimmune response where the immune system mistakenly targets skin and mucous tissue cells Genetic predisposition that increases susceptibility Certain medications, such as some blood pressure medications and antibiotics Viral infections, particularly hepatitis C Stress and psychological factors may influence flare-ups Allergic reactions to dental amalgams or other dental materials Exposure to certain chemicals or allergens

Key Symptoms: Purple, polygonal, flat-topped skin lesions that are often itchy S glossy or shiny appearance of skin patches Lacy white lines (Wickham's striae) visible on lesions Lesions may appear on the wrists, legs, or lower back In mucous membranes, such as inside the mouth, lesions appear as white patches, sores, or erosions Painful or uncomfortable mouth ulcers, often with a burning sensation Nail changes including ridging, splitting, or nail loss Hair loss if scalp is affected

Diagnosis Path: Physical examination to identify characteristic skin and mucous membrane lesions Patient history to explore symptom duration and potential triggers Biopsy of a skin or mucous membrane lesion for microscopic examination Blood tests to rule out associated conditions like hepatitis C Direct immunofluorescence testing in some cases for confirmation

Treatment Protocols: Topical corticosteroids to reduce inflammation and alleviate itching Oral corticosteroids for widespread or severe cases Phototherapy, such as UV light therapy, to manage symptoms Immunosuppressive medications when other treatments are ineffective Antihistamines to ease itching Good oral hygiene and avoiding irritants for mucous membrane involvement Managing stress through relaxation techniques or counseling Regular monitoring and follow-up for potential complications