Hi dear thanks for your question ,your having anal itching heaviness along with discharge and you feel boil or injury
inside ,Dear your right there may be a boil inside your anal canal
or you may be having injury secondary to straining on your stool.this not a serious problems ,consult some surgeon and get your proctoscopy done ( small procedure to view your anal canal) to look what is inside and get treatment accordingly.Meanwhile you can apply local ointment in the form of xylocaine
gelly 2% STOOL SOFTENER
and systemic antibiotics.