Cat scratches around ears and neck a lot little long red marks on with flaky pus-colored stuff caked redness have fleas or ringworm could it be parasite?

It's important to take your cat to the vet to get an accurate diagnosis and treatment for the skin issue around its ears and neck. Based on your description, there are a few possibilities for what could be causing the symptoms:

Ear mites: Ear mites are tiny parasites that can live in a cat's ears and cause intense itching, redness, and inflammation. They can also lead to the formation of dark, waxy discharge. If your cat is scratching its ears a lot and you notice any of these other symptoms, ear mites may be the cause.

Ringworm: Ringworm is a fungal infection that can affect the skin of cats and humans. It typically appears as circular, red, itchy lesions with raised edges. The affected areas may also have a scaly or flaky appearance. Ringworm is spread through contact with an infected person or animal, or by contact with contaminated objects.

Fleas: Fleas are small, wingless insects that can infest cats and cause skin irritation, itching, and redness. Flea bites can also lead to the development of small, red bumps on the skin. If you think your cat may have fleas, you may notice small, black specks (flea dirt) in its fur or on its bedding.

Other skin conditions: There are a number of other skin conditions that can cause similar symptoms, including allergies, bacterial infections, and autoimmune diseases. A vet can help determine the exact cause of your cat's skin issues and recommend the appropriate treatment.

It's important to note that some of these conditions can be contagious to humans, so it's important to take precautions if you're handling a cat with skin problems. Always wash your hands thoroughly after interacting with your cat and avoid touching your face or eyes. If you have any concerns about your cat's skin condition, or if the symptoms worsen, don't hesitate to contact your vet for further advice.