“…1 The secondary form
may arise from use of drugs like anabolic steroids. 6 It may also be associated with inflammatory or neoplastic
processes that cause changes in the scalp structure such as: osteoarticular diseases
(pachydermoperiostosis, acromegaly), pituitary tumors, intracerebral aneurysm, tuberous
sclerosis, amyloidosis, myxedema, dermatofibroma, acanthosis nigricans, acne conglobata,
cerebriform intradermal nevus, cutaneous focal mucinosis, scalp psoriasis, syphilis,
diabetes mellitus type 2. It may also occur in association with
various syndromes (Noonan syndrome, Beare-Stevenson syndrome, Ehlers-Danlos Syndrome,
"Michelin tire baby" syndrome, Turner syndrome and fragile X syndrome).…”