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Craniofacial Hyperhidrosis: Excessive Face & Scalp Sweating Causes & Treatment

Craniofacial hyperhidrosis = excessive sweating of forehead, scalp, face, neck. Can be primary (idiopathic) or secondary (medical cause).

Primary Craniofacial Hyperhidrosis

  • Onset: Childhood/adolescence.
  • Symmetric, bilateral, stops during sleep.
  • Genetic (autosomal dominant with incomplete penetrance).
  • Triggers: Heat, emotion, spicy food, exertion.
  • Not due to underlying disease.

Secondary Causes (Systemic/Medical)

CategoryConditions
EndocrineHyperthyroidism, diabetes (autonomic neuropathy, hypoglycemia), menopause (hot flashes), pheochromocytoma, acromegaly, carcinoid
NeurologicParkinson's, stroke, spinal cord injury, autonomic dysreflexia, Frey's syndrome (gustatory sweating post-parotid surgery), Horner's (anhidrosis contralateral)
InfectiousTB, HIV, endocarditis, malaria, brucellosis (night sweats)
MalignancyLymphoma, leukemia, solid tumors (paraneoplastic)
MedicationsSSRIs/SNRIs, tricyclics, opioids, cholinergics (pilocarpine), antipsychotics, hormone therapy, propranolol (paradoxical)
SubstanceAlcohol withdrawal, opioid withdrawal, caffeine, nicotine
CardiovascularHeart failure, MI (diaphoresis)

Gustatory Sweating (Frey's Syndrome)

  • Sweating/flushing on cheek/forehead/lips while eating (spicy, sour, chocolate).
  • Caused by misdirected auriculotemporal nerve regeneration after parotid surgery/trauma.
  • Treatment: Topical glycopyrrolate, Botox.

Diagnostic Approach

  1. History: Onset, pattern, triggers, symmetry, nocturnal?, medications, systemic symptoms.
  2. Physical: Distribution, skin changes, thyroid, lymph nodes, neuro exam.
  3. Labs if secondary suspected: TSH, glucose/HbA1c, CBC, ESR/CRP, HIV, catecholamines.
  4. Minor's starch-iodine test: Visualizes sweat distribution.

Treatment Ladder

  1. Topical aluminum chloride (20–25%): Nightly → maintenance. Irritation common on face.
  2. Topical glycopyrrolate (0.5–2%): Compounded. Less irritation. Effective.
  3. Oral anticholinergics: Glycopyrrolate 1–2 mg BID, oxybutynin 2.5–5 mg BID. Systemic side effects (dry mouth, constipation, blur, cognitive).
  4. Botulinum toxin (Botox): Intradermal injections (forehead, scalp, temples). 80–90% reduction, lasts 4–6 months. Gold standard for primary.
  5. Iontophoresis: Difficult for face/scalp (special masks).
  6. Endoscopic thoracic sympathectomy (ETS): Last resort. Risk: compensatory hyperhidrosis (50–90%), Horner's, pneumothorax. Not recommended for craniofacial.

Start with dermatologist/neurologist evaluation to classify primary vs. secondary.

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