Dating

I've been dating someone for about 2 months. I think the severity of my skin picking problem is a 5 or 6 out of 10. I'm sure he's noticed the marks on my face and body but it hasn't been brought up at all. I'm hopeful that I can change, and there are days when I avoid hanging out with him because Id rather be alone while my skin heals up. There have been a lot of these days lately and he's wondering why I'm blowing him off and not making any effort to hang out with him. He said he wants to talk about it in person. I don't want him to think I don't care about the relationship, but I also hate the idea of talking about my skin picking problem. Is there any clever way of explaining why I'm not making much of an effort to see him without making him think I'm uninterested or uncaring? Or is the truth the only way.