? New - Wet spot when giving injections

Hi,
I'm hoping someone can help. Today was the third time I gave my kitty his injection. He gets Lantus, 10 units/mg (?) once/daily, and there is always a wet spot. This last time, I made sure I could see his skin and I know it went in. What am I doing wrong? I'm so worried that he isn't getting enough insulin but I can't risk giving him more and having him experience Hypoglycemia.

 

She posted the same question in the Health forum and I moved my reply there.
http://www.felinediabetes.com/FDMB/threads/newly-diagnosed-wet-spot-when-giving-injections.162966/

 

Yes, I did. I'm new! Sorry, I noticed that I posted it in the wrong place so I did it again. Thank you for the help.