Hyperhidrosis is excessive sweating. 

It is commonly a problem when it occurs in the armpits. It will make a wet patch on the clothes. It means that people only feel comfortable wearing white or black tops and avoid coloured clothes. 

Some have to take a spare top with them to change when they get to the office. 

Botulinum toxin (Botox) is very effective in addressing this condition. 

It involves a number of tiny injections into the skin of both armpits. The effect is usually rapid, with a 75-100% reduction in sweating that often lasts for 6 months. 

Some will have the treatment at the start of summer and put up with it over winter.