Guidelines hidradenitis suppurativa
Updated on august 2019
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The lesions are painful, erythematous, red to violaceous, infiltrated, and may or may not be suppurative. They progress by outbreaks.
Palpable lesion, firm, erythematous, spontaneously painful and/or painful to touch, diameter greater than 1 cm, elevated, flat or embedded.
Elevated, palpable, erythematous lesion, diameter less than 1 cm.
Accumulated pus in a nodule or cyst which is soft upon palpation. It can open at the surface spontaneously or after surgical incision.
Small, elevated pustule with yellow, purulent contents.
(also called a tunnel, sinus or fistula) Linear cavity of variable length and depth, through which a liquid may pass, either spontaneously or under pressure.
Interconnected sinus tracts
Interconnected sinuses, with liquid discharge from several orifices. Several sinus tracts occurring in the same anatomic area, without any healthy skin, forming a suppurative mass.
These lesions are not erythematous, painful, infiltrated or oedematous. They can produce sebum, but not pus or blood.
Non-suppurative sinus, painless
Clinical presentation identical to nodule, but the term cyst supposes the existence of its own peripheral wall, observable at excision (epidermal cyst, for example).
One or more depressions
Elevated, but malleable at palpation
Elevated, including at palpation
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