Patients with acne have seborrhoea not only of the facial skin but also of the scalp. There are no quantitative data on  this latter  correlation but  the  opinion  of most clinicians  is that such  a relationship seems  likely.

  Rarely, an androgenic  tumour  such as Cushing's syndrome can present  as acne.  Similarly, some patients with the Stein-Leventhal syndrome may present with acne. Despite the rarity of these occurrences the physician should always be aware  of their possibility.

  An excessively rare complication of acne is solid facial oedema.  This author's department has seen three patients in  eighteen years, while Connelly  and  Winkelmann reported four patients. Elastic compression, oral steroids and intensive acne therapy were found to be of minimal  benefit in  resolving the oedema. The problem  constitutes a vicious circle so, in a patient who has this complication, it is essential to treat the acne, however  mild, aggressively in order to bring it quickly under control.  This may help to  contain the oedema which presumably is  due to hypopolastic or aplastic lymph vessels. No lymphangiography was performed in this department's or published data.