Yes. Fissure local examination is by P/R , in that finger insertion is there but don’t worry , it’s with lignocaine jelly 2%

Try to modify your lifestyle and food habits so that you might feel easy  while defecation and along with that I advise sitz bath and laxative support so that your fissure might heal.if if there is no response kindly go for a physical consultation

Just by finger separation of outside of canal

In anal fissure generally we avoid checking with finger Just looking at anal are fissure is seen If you are having pain while passing stools first try conservative with 1.green leafy vegetables, 2. Plenty of water, 3. Avoiding non veg for few days till u pass soft stools 4. You can use syrup lactulose at bed with plenty  of water for soft stools, 5.finally sitz bath using dettol  liquid  with  lukewarm  water It means you have to sit in small tub for 15 min two times daily will help

Fissure can be seen at anal opening without using any device