Anal fissure?

I am a 27 yr old female. Weighing 80 kgs at 5.6 height, no health issues besides it. For the past 2 days I was feeling burning like a deep scratch right above my butt crack on the thin moist skin. My partner checked it and saw it bleeding and it had a bad odour to it. I thought to myself that i probably scratched myself. However looking it up on google and reddit it said it was a fungal infection. I decided to see my GP. My GP said its a fissure and it needs to be kept dry and prescribed taro-fusidic acid 2% 3x a day. What are the measures I need to besides the cream to heal the fissure?? I do suffer from constipation and shall be taking laxatives