If it’s a fissure it will look like a little blob on your rectum. Most of the time they go away on their own. Germo loids from will help with the pain available at the chemist.
Now if it’s a fissure it’s a tiny tears in your rectum which will itch, sting , throb and sometimes bleed. The treatments are change of diet that includes plenty of fluids and fibre and you may be prescribed movicol to help you go to the loo easier.
If this doesn’t work, you will be prescribed a cream called rectogestic.
If none of the above works you will be sent to a colorectal consultant who may offer to inject botox into your spinchter which loosens it off and aids healing.
If that fails they will cut into the muscle and let it heal naturally.
I had botox in January for mine under General and it’s now healed, I skipped the recto gestic cream as it didn’t work well with my bp meds.
My advice get to the Gp and try get a diagnosis and treatment before it gets worse as a anal fissure can hurt a lot of left without treatment.