You may have a fissure. Best way to deal with a fissure is to clean the area off with a hydrogen peroxide compress ... Tucks can be VERY irritating.

If you have pink when you compress this area (our filters here remove the A word), then it can be a simple fissure.

Once it is clean, you can either 1) use triple antibiotic for a day or two , and then 2) move on to A and D ointment. This will heal it up pretty fast and form a protective barrier. Don't apply any ointment over a non-cleaned area.
The Americaine is really nice....it is a clear non staining gel base, and very effective. 20% benzocaine with a anti-bacterial
ingredient called benzalconium chloride. I used this 28 yrs ago when I had a fissure after my son was born. It has never failed me. Americaine can be used for burns, or painful insect bites as well. I usually have this gel/ointment last more than a year or so. It seems to never go bad. It is a great thing to have in your medicine cabinet...you never know what life will throw at you!