I have dark marks on the tip of my toes which looks like blood clots underneath the skin. there is no pain and its been there for 2 months.

See a dermatologist: It is difficult to make a proper diagnosis since I am not there to see the condition. I recommend seeing a dermatologist so that they can make a proper diagnosis and give you something to get rid of the condition or relieve symptoms.

Hematoma: It could be a hematoma from injury and this can take several months to come to the surface of the skin.