Acitretin: Use in Psoriasis and Keratinization Disorders

Overview / Definition Acitretin is a second-generation retinoid that is predominantly used in dermatology for the treatment of severe forms of psoriasis and other keratinization disorders such as ichthyosis and palmoplantar keratoderma. As a systemic medication, it is effective in reducing hyperproliferation of keratinocytes and normalizing their differentiation. Epidemiology Psoriasis affects approximately 2-3% of the global population, with severe cases requiring systemic therapy such as acitretin. It is more prevalent in Caucasians and typically presents in early adulthood, although it can occur at any age. Pathophysiology / Mechanism Acitretin exerts its effects through several mechanisms: Keratinocyte differentiation: Modifies the growth and differentiation of epithelial cells. Anti-inflammatory effects: Reduces the inflammatory response associated with psoriasis. Immune modulation: Alters cytokine production, leading to decreased T-cell activation. These combined effects help in reducing the characteristic plaques seen in psoriasis and other keratinization disorders. Clinical Presentation Patients with psoriasis may present with: Red, scaly plaques commonly found on extensor surfaces, scalp, and lower back. Itching or discomfort associated with the plaques. Potential systemic manifestations in severe cases, such as psoriatic arthritis. Keratinization disorders such as ichthyosis present with dry, scaly skin, often leading to significant cosmetic concerns and discomfort. Diagnosis / Workup The diagnosis of psoriasis is primarily clinical, based on the characteristic appearance of the skin lesions. However, in atypical cases, skin biopsy may be utilized to rule out other conditions. Key steps in the workup include: Clinical history: Family history of psoriasis or other skin conditions. Physical examination: Assess extent and severity of lesions. Laboratory tests: Consider CBC, liver function tests, and lipid panel prior to initiating acitretin treatment. Treatme