Put topical antibiotic ointment on it.

Deer ticks don't get blood engorged like dog ticks and will remain flat. Do you have any idea how long it was there (based upon when you would have picked it up)? Transmission of diseases are more incline to occur the longer they are attached, like over 24-48 hours. This is why they recommend you check for tick immediately after being in an area prone to having them (woods, trails, etc).

Sounds like you've done everything and got it off quickly.

Some deer ticks are only pin size and look like a TINY freckle. And it's the smaller ones that seem to transmit more diseases, but I don't know why (just what I've read).