hold forth on/about (something)
to speak in public, to talk about something
My boss was holding forth about taxes last night when I saw him in his office.
Uncontrolled stress can make your skin more sensitive and trigger acne breakouts and other skin problems. To encourage healthy skin and a healthy state of mind take steps to manage your stress. Set reasonable limits, scale back your todo list and make time to do the things you enjoy. The results might be more dramatic than you expect.