Hello, I am a 29 year old male and I have been having a reddish pimplish-like bump at the butt-hole. I have no idea why, and it is getting larger. This has never happen before, except one time in my life, but it disappeared soon enough. I am a very hygienic person, so I am wondering why I am having this. I eat healthily, and I have a habit of taking warm foods & drinks like pineapple, mangoes. (I dislike cold drinks & food). Please if you could tell me how should I treat this, and why am I having it.