This is the first time this has happened.
I am going to make it clear that I think this happened because I didn't wash my hands before I anally masturbated.

It doesn't hurt anymore but I am really scared and I want to tell my parents.
It's 1:58 AM here so they're both asleep.

Should I wait and see if it gets worse before I tell anyone? Or should I wake up my parents and tell them?

Insight as to what you think this is would be greatly appreciated.