I have a deep split between my toe, not sure if it's tinnia. what do you recommend?

Below: Try keeping the area clean and dry. Wear cotton socks during the day. At night put some bacitracin ointment on --or any antibiotic ointment. If there is any signs of redness, drainage, or infection, then you need exam by DR> If this is not effective in two weeks, then exam suggested.

Best to check it.: this sounds like the split is between the 4th and 5th toes. (little toe and one next to it.) If so, then you should pass go and head right to a foot specialists office. The cause may not be as simple as it sounds.