Obviously, I can't say for sure, because I don't know what your co-worker had. However, I doubt that you have anything to worry about. If these "barnacles" were some sort of infection, bacterial or otherwise, you most likely would have caught it right away of you were going to catch it at all. Is your co-worker still there? Perhaps you should ask what this "terrible disease" is. Meantime, I wouldn't worry. If you get a skin condition, show it to a doctor.
Take care.
Dr. Rockoff
Dr. Rockoff