Hot weather and dehydration can lead to an attack of Gout.
You can see the white lumps under the red skin on the second toe in this picture.
The white lumps are ‘gouty tophi’
Gout is a form of arthritis and many people who have the issue are on constant medication to prevent it.
Seek advice from a state registered (HCPC) podiatrist if you are concerned about your feet or foot pain.