To dream of poison oak may represent feelings about yourself or someone else being embarrassed by something that you don’t understand at all.
To dream of getting poison oak on your skin represents lingering feelings of embarrassment or annoyance about yourself being stupid for not thinking clearly. Feeling stupid about getting involved in a situation that you are had no foreknowledge about. Possibly a sign that you have lingering feelings of humiliation about a situation you couldn’t have possibly prevented.
Poison oak commonly reflects feelings about embarrassments caused by old relationships with people you wish you had known better before getting too involved with.
Example: A woman dreamed of having a poison oak wound on her skin and that was being cleaned out by her tears. In waking life this woman had been humiliated years earlier by her ex-fiance when he left her days before the wedding. She was now currently getting married again to someone else and felt that this marriage might restore her dignity after having been made to look stupid in front of all her friends and family about the previous failed wedding.
may have reflected her lingering feelings of stupidity for never knowing her ex-fiancee better as a person before embarrassing herself with a failed wedding.