So I've noticed lately Chai's scales on his head are looking rather red/raw. My first thought was ammonia burn but I that seems unlikely to me because I do a 100% water change every 2 days. There's nothing he could scrape himself on because all of his plants are silk. I've never really seen this before so I was wondering if anyone could take a look at the pictures below and tell me what they think it may be.
His fins seem to be a bit red as well...
He's young so at first I thought he was just changing colors and turning more pinkish but the top of his head doesn't look very good.