It is a dream where bad things happen and suffer.
In dreams, the skin means your current state.
A dream with a skin disease on my finger doesn’t work out well.
It means you’re in trouble.
Which means you’re either worried because the back of what you’re doing isn’t clean, or you’re having problems with your personal relationships.
It’s a dream you’ll have a hard time with.
Be careful in everything you do and make sure you don’t get hurt.