I've only had him for a week or so and noticed the bottom of his shell, is this the start of shell rot or just normal coloration?
Here's another picture
it might just be a little "wear" from laying and crawling and walking and etc. Or it may just be new growth. I don't really see any signs of shell rot but keep a close eye on it. If it turns brown and turns soft and spreads, then I would take a new pic and ask for suggestions and treatment options Cute little thing ya got there~