What's on my trigger?

[jason604]

So I've got my trigger for about 2 weeks now and today was the first day he actually came out n chill around tank all day. Normally he just hides under a rock. I notice something near his tail. It doesn't look like ick it's too big n not fully white. Is this bad? I did not quarantine him but I did. Inspect him when I bought it and he did not have anything on him before. He still eats like a pig and looks super happy. My hippo tang that I bought same day as him did get ick the day that I swap tanks(must have stressed him) but it went away the very next day and he's super happy n eats tons. Should I be worried about my trigger or is it just a scrape on the rocks? He's my fav fish!