Causes of hard pimples on cats' heads
There is a hard little pimple on the cat's head, but it won't shed hair. It may be that the cat had an injection before, because of drugs. This is normal. If you leave it alone, acne will slowly disappear by itself.
Collision will also make a hard pimple grow on the cat's head. When the owner touches this pimple, the cat will feel pain or resist touching. In this regard, the owner can simply disinfect the wound with iodophor.
If the small hard pimple on the cat's head doesn't feel pain, the cat has no other abnormal symptoms, and the pimple is not getting bigger and bigger, then it is generally nothing, just like a person with a mole, which is harmless to health.