Thank you so much for your advice! Yeah, I have absolutely no idea what this could be.What I did do, though, is because this is so hard to see with the naked eye (it just looks like a wet spot on his head) and maybe I just haven't noticed it, I went through some pictures I took last month to see if I could notice something I may have missed. In one picture of him, I think I do see the start of something? It's a little bit on his left side of his head. I circled it, but honestly, it might be hard to see. This picture was taken on July 4th, so over a month ago. I'm not sure if this information helps anything, but it might be important that it looks like it's been going on for a while.
Poor guy. I feel awful that I didn't even notice.
Thank you again so much for any ideas!





What I did do, though, is because this is so hard to see with the naked eye (it just looks like a wet spot on his head) and maybe I just haven't noticed it, I went through some pictures I took last month to see if I could notice something I may have missed. In one picture of him, I think I do see the start of something? It's a little bit on his left side of his head. I circled it, but honestly, it might be hard to see. This picture was taken on July 4th, so over a month ago. I'm not sure if this information helps anything, but it might be important that it looks like it's been going on for a while. 
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