Suggest Remedy For Sore Navel Along With Infection

Hello, I think I have an infection in my belly button, I know it sounds bizarre but I ve had it for around 4 years now, it s very red and really bad smelly like it makes me feel physically sick when I smell it which is every time I undress basically... This strange fluff like stuff which has green and white bits attached to it comes out quite frequently, I ve heard to wash it with alcohol, it didn t make a difference, and with salty water, or even just water but has made no difference I ve also tired an antiseptic talcum powder which had no effect, can anyone tell me what this is???