Chronic reactive form of annular erythema with circular, arciform lesions. Characterized by delicate scale behind advancing edge. Typically affects thighs, buttocks, and upper arms. Starts as pink papule, enlarges to annular plaques with central clearing
Autoimmune skin blistering disease affecting subcorneal epidermis layer. Characterized by scaly/crusted erosions with erythematous base. No mucosal involvement even with widespread disease. UV radiation exacerbates symptoms and causes burning
Pneumonitis is general inflammation of lung tissue. Can result from radiation therapy, medications, inhaled debris, or systemic diseases. Unresolved inflammation can lead to irreversible damage like pulmonary fibrosis
Addison's disease is a rare endocrine disorder affecting adrenal gland hormone production. Affects about 9-14 per 100,000 people in developed world. Most common in middle-aged females
Pulmonary involvement occurs in over 90% of sarcoidosis patients. Most common in patients aged 20-40, with female predominance. Approximately 50% of patients are asymptomatic. Respiratory symptoms and skin changes are common presentations
Rapid onset facial nerve paralysis resolving in 6-8 weeks. Affects 25 cases per 100,000 people annually between 15-50 years. No gender predominance