Well that's not true. We are consciousness, our thoughts are everything, you could be very well be the reason why your disease lingers. Someone who has allowed their egoic mind to overtake them, they begin to live life completely in their thoughts, living in the past and worrying about the future. You are constantly distracted from the here and now, the present. Theres so much mental illness in western society because people dont take mental health serious, or spirituality which is very foolish. If you often experience a negative state of mind your setting the perfect environment for illness and disease.
You need to take back control of your mind and stay in there here and now, where negative thoughts cant exist because you live in the no thought state of mind, what meditation teaches you. This is hard to understand for many and would take me too long to explain but if your interested you should read a book called "Be here now" for a lot of you may very well change your life. Especially people with acne who most of the time have become slaves to their egoic mind. Someone who struggles with staying in the present and has anxiety, depression, nervousness, worry literally needs to take life just as a drug addict and take it one step at a time. Moment by moment. Be aware of your thoughts that send you into negative places and erase them, bring yourself back to now, be focused on what your doing. Many people are so used to living in their thoughts its very hard to break that spell, your ego mind wants you to distract you from the now and keep you down, you need to learn to expel those thoughts, forgive yourself. Your suffering will end when you are able to learn how to live life completely in the present.