Suspicious Mole

Hello, my name is Bill.

I had BCC on my nose a few years ago and have a variety of sun damage lesions on ears and head.

I am also Anti-TNF treatment for RA.

i have had a mole on my upper right arm for many years but in the last few months it appears to have enlarged slightly and got thicker.

Should I worry? 

I can send a photo but I can’t see anyway to attach it to my post.

Kind Regards, Bill.