Your symptoms suggest severe skin barrier damage with post-inflammatory hyperpigmentation (darkening caused by chronic irritation). Stop using all scented products or harsh scrubs immediately. Switch to a thick, fragrance-free barrier repair cream containing ceramides, hyaluronic acid, and colloidal oatmeal to restore moisture. Additionally, apply a broad-spectrum SPF 30+ sunscreen daily, as irritated skin darkens easily under the sun. Because of the persistent irritation and skin darkening, you may require a prescription-strength anti-inflammatory cream. Please consult a dermatologist for a proper diagnosis and a targeted treatment plan.