How to distinguish whether the skin is broken or not when bitten by a dog?

If you are bitten by a dog and cannot tell whether the skin is broken or not with the naked eye, you can use alcohol to judge. If there is pain, it means the skin is damaged. It is a secondary exposure and needs to be cleaned and disinfected in time. Wash the wound with soap and water for more than 20 minutes, then repeatedly apply iodine and medicinal alcohol and disinfect 2-3 times. And judge whether to vaccinate based on the situation.