dog has a hard dark scab looking & red sore can somebody please help me i am afraid to touch her?

My dog has a red bump on her back Top is hard dark scab looking & red sore looking underneath next to skin

Take her to the vet for a check-up, but for now you can wash it gently. Mix a little ordinary table/cooking salt in water (about a teaspoon in a pint of lukewarm water). Using cotton wool (or a clean cloth) lightly wash the wound with the salt solution. That will clean-up any dirt or anything loose around the wound. Try to stop her licking the wound as this may open up the scab.Take her to the vet in the morning.

Take her to the vet,we don't know what it is,an expert needs to take a look.