This study is to evaluate the safety of AMG 403 in healthy adult subjects. The study consists of a 21 day screening period followed by administration of the investigational product and up to 154 day evaluation period.

Inclusion Criteria:

• Healthy men and women of non-child bearing potential,
• Between the ages of 18 and 55 inclusive,
• Body mass index from 18 to 33 kg/m2,
• Skin type compatible with the study assessments, and without significant skin allergies, pigmentary disorders, tattoos, or any active dermatologic conditions that might interfere with the study conduct.

Exclusion Criteria:

• Prior or current history of peripheral neuropathy, paraesthesias, dysesthesias, herpes zoster, post-herpetic neuralgia,
• Evidence of any current illness such as a common cold, viral syndrome, or flu-like symptoms, any disturbance of the autonomic nervous system,
• History of Raynaud's phenomenon; Know allergy or intolerance to capsaicin or hot peppers.