Improvement of overlapping hidradenitis suppurativa and ankylosing spondylitis after the introduction of adalimumab.

Hidradenitis suppurativa is a chronic inflammatory disorder characterized by occlusion of the follicular pilosebaceous units of the skin. The treatment options are sometimes very limited and unpleasant odor and abundant drainage complicate the disease. Ankylosing spondylitis is a form of seronegative spondyloarthritis with predominantly axial but also peripheral joint involvement.