Hyperhidrosis is excessive sweating or facial flushing. It can affect several areas of the body;
Palmar Hyperhidrosis
Excessive sweating of the hands which is not only embarrassing but makes life very difficult as constantly wet hands transfer moisture onto anything you touch.
Facial Hyperhidrosis
Uncontrollable facial blushing.
Plantar Hyperhidrosis
Excessive sweating of the feet resulting in wet socks and shoes.
Axillary Hyperhidrosis
Excessive sweating in the underarms causing large wet areas, staining of clothes. and enormous embarrassment affecting quality of life.
Sweating is controlled by a type of nerve called a sympathetic nerve. Various techniques and medications can be used to try and reduce the activity of these nerves. Surgery is an option to disrupt the nerve and reduce the problem but a much less invasive option is to have Botox injections to the affected nerve. This is carried out in the clinic, is a little sore and obtains a very good result. The down side is that it does not have a permanent result but usually has a good effect for 6-8 months and can be repeated without any known problems.
Additional Information on Hyperhidrosis
https://www.nhs.uk/conditions/excessive-sweating-hyperhidrosis