Annular Lichenoid Dermatitis of Youth: Its Pathogenesis, Diagnosis, and Management.

Annular lichenoid dermatitis of youth (ALDY) is a newly described controversial benign lichenoid inflammatory cutaneous disorder often characterized by annular patches with hypopigmented center and surrounding erythematous border. Primarily, it affects the trunk and groin of young patients. Since its first description in 2003, additional patients have been reported, leading to better characterization of the entity; nevertheless, the pathogenesis is still unclear, and several hypotheses have been provided about possible triggering or causative factors. It tends to follow a chronic course, with some lesions spontaneously remitting, while others may be persistent or recur post-treatment. No standard validated treatment has been indicated so far for this disorder. Commonly prescribed topical treatment includes corticosteroids and calcineurin inhibitors with variable response.