I hate :reddit-logo: with every fiber of my being, but unfortunately, that hellsite has taken over the entire internet when it comes to asking rather specific niche questions. Can you help me find the correct sub-reddit?

I was in the Hospital the last few days, and one day found some rather strange white stains beside my bed when I woke up. Took some pictures, and now I want reddit to help me solve this mystery for me, but r/askdocs is only for medical advice, and r/askreddit doesn't allow me to explain my situation. r/RBI deleted my post without any explanation.

Which sub-reddit would you suggest to ask for advice?