I found a tick attached on one of our dogs' head about a month ago. (I couldn't believe that I found a tick in December!) The bite area always gets reddish and a bit lumpy after pulling a tick off from the dogs, and the same thing happened when I got rid of the the tick on her head. But this time the tiny lump (about 2mm) won't go away. Should I do something about this? Thank you very much for your help.


