I'm sorry you are short of money but really you must seek veterinary advice, the forum terms and conditions state that everyone here must agree to seek veterinary care when needed.
Scabs on the chin could be chelitis- a bacterial infection around the lips requiring prescription antibiotics from the vet- or may be ringworm, a fungal infection that is very contagious and also requires prescription treatment. Or, could be any other of a range of issues, only a vet can say for sure after giving piggy a hands-on examination!