Hi, I'm Dr Chaithanya, an experienced General Physician attending you today.
The condition of excessive sweating is called Hyperhydrosis. It can be primary without any causes, called Idiopathic or primary hyperhidrosis or it can be secondary due to hormonal conditions like hyperthyroid or few vitamin deficiencies.
There can be more sweating at places that are termed as selective hyperhidrosis or primary focal hyperhidrosis.
The yellow color is due to the sweat interacting with bacteria that is present on the skin, and after interaction it can leave an odor and a yellow stain.
Possible treatment options are,
1. Wearing loose cotton clothes and maintaining cleanliness
2. Using mild antiperspirants
3. Periodic Botulinum toxin injection
4. Destruction od exocrine sweat glands at the places of excessive sweat using microwave energy/laser
You need to discuss the options with the dermatologist so that he can suggest you the right treatment based on your body conditions.
Hope the information helps!
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Have a speedy recovery!