Chronic Hand Eczema (CHE): A Narrative Review.

Chronic hand eczema (CHE) is a common and challenging skin condition, characterized by persistent hand dermatitis which lasts over 3 months or recurs at least twice a year. This condition is often multifactorial, involving genetic predispositions, environmental factors and triggers, such as irritants and allergens. Studies show a higher incidence in women, though prevalence estimates vary across different age groups. The pathogenesis involves complex immune mechanisms, particularly Th1/Th2 cell responses. Clinically, CHE presents in various forms, with symptoms such as redness, scaling and itching that significantly impact patients' quality of life. Treatment approaches are diverse. While emollients and topical corticosteroids have historically been the mainstay, new systemic therapies like JAK inhibitors and biologics are progressively being used for severe cases. Key molecular targets comprise interleukin (IL)-4 and IL-13, the JAK-STAT pathway, phosphodiesterase 4 (PDE4) and chemoattractant chemokines. Managing CHE effectively remains a challenge because of its chronicity and the variability in individual responses to treatment. However, emerging therapeutic strategies will help clinicians to offer more patient-centred approaches.