In need of advice!

I asked him to go see his doctor and he got offended. He took it the wrong way and thinks I don’t want to be intimate with him anymore. The spots are not bumpy. They look like freckles but freckles are supposed to be brown and his look dark almost with a blue tint to them. I really don’t remember seeing this spots before I barely noticed them about two months ago while I was giving him a BJ in the middle of the day when it was bright and shining. I’ve tried to routinely check but he gets offended and refuses to let me check him. He says he is embarrassed and feels uncomfortable because I’m checking for something that is not what I think. He repeatedly says they are birthmarks and he has always had then and he said he first noticed them when he was 14 years old.

I wish I had a picture..

I feel frustrated because it bothers me he won’t let me check. It could be something serious and he says if it was anything his doctor would of told him something last year when he had his physical exam. He is 34 years old.

And I truly don’t remember seeing it before.

How can I convince him to go get checked. 

I feel bad to admit it but it’s bothering me to the point i don’t want to have oral sex with him or sex without condom and I know that’s why he feels unwanted, I feel terrible to make him feel that way. We have an 18 month old and we were TTC baby#2 before this and I don’t even know how to avoid sexual contact without condom. I know he feels rejected and it’s painful for me to reject him because I love this man and I know he loves me too but I cannot get this off my mind.

Am i overreacting, overthinking this? 

Could it be possible that I hadn’t noticed because the spots hide in when his penis is erected? 

I don’t think it could be an STD because it doesn’t look like one (or at least from the pictures I seen on the internet) 

I got my bianual check last year in November and everything was clear so if it was HPV I think it would have showed on me. He got his bianual check last year too after me in December and everything was clear too. I don’t have reasons to suspect of infidelity that’s why I don’t think it’s an STD my concern is a cancerous disease because I know it runs in his family.