Autoinflammatory Disease Damage Index (ADDI): a possible newborn also in hidradenitis suppurativa daily practice.

To the Editor: Ter Haar et al report a new tool, Autoinflammatory Disease Damage Index (ADDI), to measure damage caused by autoinflammatory diseases. Although this preliminary instrument was for patients with familial Mediterranean fever, cryopyrin associated periodic syndrome, tumour necrosis factor receptorassociated periodic fever syndrome and mevalonate kinase deficiency, we found a great utility also in another auto inflammatory disease (AD), namely hidradenitis suppurativa (HS). HS is a chronic–relapsing, debilitating autoinflammatory disease affecting apocrine gland-bearing skin which is estimated to affect 1% of the population. It is occasionally inscribed into more complex autoinflammatory syndromes, such as PASH (pyoderma gangrenosum, acne and HS), or concurrent with other dysimmune conditions such as Crohn’s disease. HS severity is variously assessed by static scores, such as Hurley’s or