An acne-like thing on a cat’s head may be cat moss or a lipoma. If dandruff, redness, swelling, scabs, etc. appear around the acne, it is caused by cat moss, and the cat needs to be treated with fungi. Use ointment or spray to prevent the spread of cat moss; if there are no other conditions, it may be a lipoma. It is best to take the cat to the pet hospital for examination to avoid delaying the condition.