If a tick head is left in a dog following the tick-removal process, cleanse the area with warm water and mild soap, then monitor for signs of infection. If redness, swelling or rash appear, apply an Epsom salt soak to the affected area several times a day.
The Epsom salt soak involves preparing a solution of warm water and Epsom salt, dipping a washcloth in the solution and applying it to the inflamed area for five minutes. Not only does this draw out the infection, it loosens the tick parts remaining in the skin and brings them to the skin's surface.
If a tick head remains untreated in a dog, granulation tissue forms around the tick head, preventing infection from spreading to other parts of the dog's body. If the tick head remains embedded and the site remains inflamed, a vet may need to remove the tick head.