Causes of pimples on cats' necks:

1. It may be infected with mites. If it is internal infection, they are parasitic in the skin hair follicles, so they will look like pimples.

2. It may also be caused by mites parasitic outside the body or inflammation of the ear canal. They scratch the itchy area with their claws, causing scabs and pimples.

3. If the area has been vaccinated or injected with drugs, it may be caused by incomplete absorption of the drugs. Usually oil drugs and rabies vaccines are difficult to absorb.

4. Symptoms such as eczema may also be caused by bacterial infection.

5. Also observe whether the cat has other allergic symptoms. If so, it needs to be sent to the hospital for treatment.