There are many different things you can do to keep your skin healthy such as not eating foods that are bad for you, cleansing with the right products, and even doing less conventional things like going to the sauna. It is evident that you have tried absolutely none of that. Try a bit harder to take care of yourself and you will find that you respect yourself a lot more and you will also find that you no longer desire to do harm to yourself in the form of eating foods that are bad for you and taking part in things that you know will not be good for you.
These dreams can also expand to other areas of your life, not just personal hygiene. For example, if your leg is covered with boils in your dreams it could be your mind’s prerogative to make sure that you do your best to run more. The mind is drawing attention to your legs so you will remember to be good to yourself and get some exercise done. Even if it is hard and not so fun, it is good for you, and it is something that you should do often if you want to keep in shape. Even if you don’t want to keep in shape you should still do these things which make you feel a lot more accomplished and proud of yourself. Having boils all over your body in a dream suggests that you should try harder to take care of yourself physically, mentally, and spiritually.
The immune system which is part of what keeps boils from happening does not respond well to nervousness. Do you feel nervous about something? Because if you are dreaming that your skin is covered in boils, it is probably because you feel nervous about something and this is the way that your mind is choosing to cope with that. It is a rather poor coping method since it involves you feeling terrible about yourself and a nervous wreck, but it is at least nice for you to know that something good can come of it. Now you know what to do about the things that are keeping you nervous, just stop worrying about them. It is the best thing you can do for yourself in order to keep you sane.
If you dream that someone close to you has boils, this might be because you feel as if you are not close enough to them. They come down with boils in your dream to bring attention to the fact that you were already trying to avoid them. This is a sign that you need to spend more time with your friend in the waking world. Don’t exclude him or her from your life for any reason. They need to be included so let them be included.