What is the purpose of the minor's iodine-starch test in the context of axillary hyperhidrosis?

The Minor's iodine-starch test is used to identify the areas of excessive sweating in axillary hyperhidrosis by showing a purple color change where perspiration combines with iodine and starch.

The Minor's iodine-starch test is a diagnostic procedure used to pinpoint the specific areas of excessive sweating in patients with axillary hyperhidrosis. During the test, the patient's axilla is painted with an iodine solution and then sprinkled with starch. When perspiration occurs, it reacts with the iodine and starch, resulting in a purple color change in the hyperhidrotic areas. This visual indication helps in accurately identifying the regions that require treatment with botulinum toxin injections.