Can hot water and changing cream always cause Dark knuckles?

Treatment on dark knuckles.
I. If you re a health worker and you wash your hands frequently with hot water, you will get very bad dark knuckles.
2 if you love to change your body cream always, it will give you dark knuckles.
3 if you change your body soap all the time, you will have dark knuckles.
Stop using hot water to wash or rinse your hands, it will give you bad dark knuckles.
Solution to dark knuckles.
Lemon
Sugar
Mix both together, scrub it very well, you can as well use it for Knees and elbows.
Wait for 20 or 30mins before you rise it off with warm water.
Or Colgate toothpaste (white one) one teaspoon
Sugar 3 teaspoons
Lemon one
Mix all together and apply to dark knuckles only
Wait for 20mins.
Apply coconut oil and moisturizer.
When applying the Lemon & Sugar make sure you put it on the dark knuckles only, avoid the other parts, if not you will get two colours, one part will be lighter than the other part.

Credit goes to the owner.