Why can thrush appear because of being bitten ..?

Canker sores appear because of the wound. Wounds that form as a result of something hitting the soft tissues in the mouth are referred to in dentistry as Traumatic Ulcers or Traumatic Ulcers. The cause of a traumatic ulcer is usually clear, does not appear suddenly without a cause and the cause can usually be identified. Traumatic ulcers are caused by trauma in the form of physical/mechanical trauma (bites, bumps, punctured with braces) and/or thermal (eating too spicy and/or hot food that injures the soft tissues of the oral cavity).[1] Traumatic ulcers can also occur as a result of malocclusion in which teeth injure the soft tissues of the oral cavity, ill-fitting dentures, excessive brushing and flossing and injuring soft tissues, habitual self-injury, and piercing of the oral cavity.[2] Usually, the tissues of the oral cavity affected by traumatic ulcers are the lower lip, inner cheek tissue, and tongue.