How can i get rid of a small blood clot under my big toe?

Under the toe: Or under the nail? If under a nail don't attempt yourself, see a diarist. If on the skin, i would leave it alone. You can soak it in warm water and day by day it should get smaller. This is not a true "blood clot".

Drain it. : Is it fresh? Old blood clots will not drain-dry. I do not recommend that people do this on there own due to pain & the risk of infection but if you are determined to save some money. Take a safety pin and get it hot from a liter. Touch the nail plate with it over the blood clot just enough to get a little blood out. Gently squese the nail & milk the blood out. Antibiotic cream band aid.