The tick is a male nymph American Dog Tick. I scratched the back of my head and thought it was a scab on my head and pulled it off. The tick is not alive and it is not engorged. I know it has been dead (maybe by washing my hair or the hair dryer) because the tick is flat and dried up. However, I know it was attached because I heard it popped when I pulled it off. The head is still attached to the tick but when my grandmother inspected it, there is a distinctive bite mark on the back of my head and a kind of splotchy rash that trails to the nape of my neck – straight down. The rash is square in shape and does not extend above or to the side of the original bite – just straight down about 4 inches. Is this normal? No fever, no bulls eye rash, no aching but I have no idea how long it was attached or how long it had been dead. And Y E S – I’m still GROSSED OUT and all icked out about it. I know it’s not Lyme disease or Rocky Mountain Fever. Too soon for that….
I hope… 
It’s not Lyme Disease – American Dog Ticks don’t carry Lyme. It’s not Rocky Mountain Spotted fever, the gestation period for rash is several days out and it genereally doesn’t affect the bitten area, the hands and soles of the feet. Just checking to see if rash is normal. I can’t find anything regarding a rash around the bitten area.
The fact that you heard a "pop" suggests that the tick was engorged and my guess is the "rash" you have is from scratching your head before you found the tic.
Or it is the result of the toxin released by the tick upon attachment which will pass soon.
Clean it with peroxide and watch it. There are many diseases that ticks carry and while the dog tick is pretty harmless any bite should not be ignored.
I am a person who has been disbaled by Lyme disease. My advice is to be careful. Where there are dog ticks there are deer ticks.