Hi welcome to HCMForum. It appears that the neglected fissure led to the formation of an abscess
. of course
it has started regression. it may need drainage
for complete cure. fissure needs surgical manipulation for cure.
Besides i advise you some diet recomendations as let him take plenty of water. he should eat more of green
leafy vegetables fibrous foods fruits and juices. for natural healing and to get soft stools. finally i advise you
to consult a surgeon for manipulations. thank you.