Somehow you must learn to live with the situation; if you can't you must be honest with fiancee and leave. I would calmly speak with him and explain that you do not want to come between them and wish things could be resolved so stress on everyone would be reduced; however, what he decides to do with his daugher is his business and you will always support him.  Then keep being sweet to the girl and hopefully dad will be impressed with how constructively you are handling this and how destructively his daughter is, how happy you make him and his daughter doesn't, and then - happy wedding. (don't let this girl ruin the rest of your life,

Atopic dermatitis is a term encompassing skin conditions from no discernible cause, it is not a specific diagnosis.  See a dermatologist who will probably give you ointments and creams and if necessary (if lesions are open) an antibiotic.  This will probably disappear on its own in due time.

Late to the show, but my humble opinion ... 23 years old? Does he work and pay you room and board for both of them? earn enough to support them both?  If so, why do they live w/you?  I suspect you know the answers you seek.  Also, old sayings become old sayings b/c most times they are true; thus, we were unable to see the truth of the advice our folks handed down to us until we were in their shoes (as they experienced with their folks). If you really want to help him, sit him down, calmly review things, always emphasizing your love for him and desire for him to have a fulfilling, rewarding and happy life, which he will not achieve until he changes things; you've tried tro help him and now the best you can do for him is put him out on his own, with or without the girlfriend.  It is time he becme a responsible adult.  Give him a three or four week deadline and offer to help him find another place (but do not give him $) Honest, this is the best for him. Be strong and do not blame yourself for anything. I am sure you (as most of us) did the best you could at the time and that my dear is success.