If you were a US citizen, it would matter very little. As an international with guaranteed admission to your local medical school, you may be giving up your opportunity to study medicine by going to Howard. There are very, very few spots available for international students in US medical schools. Many state medical schools will not even admit US students who are not residents of their state. Among the private medical schools, international admits are still very rare - you can check the statistics by looking up the admissions stats for each school. It is much more common for graduates of foreign medical schools to apply for residency in the US once they have completed their training.
I would also add that if you are attending Howard on a merit scholarship, I assume if means your family is not wealthy. Medical school is very expensive in the US and you would need to take out major loans, even if you could get in. There is no merit aid based on financial need for medical school. (Although there are a few programs for US citizens with the military or public health service that will cover costs in exchange for service commitments.)