Most common are dreams in which you have pricked yourself on thorn. This dream in general signifies that there will be some loss of reputation due to unavoidable causes which are typically connected with destiny. You will be able to regain your reputation but only with hard work and dedication.
If you prick yourself on a thorn and the thorn remains embedded into your skin than it can be considered that you will have more difficulty getting to level of reputation that you had in the past. In such a case, you might need outside help if you want to reestablish your reputation.
If you have thorn embedded into the skin and someone else helps you to get it out it means that you get help in your personal life right when it will be most needed. Some form of great emotional support will be given to you and this will be greatly helpful.
If someone that you know has a thorn embedded into them and asks you to help them get it out it means that you will do an immeasurably great service to that person in real life. You might even save them from certain death in the upcoming months. This is especially true if this dream is dreamt during the early morning hours or during a daytime nap.
The meaning of a dream in which piece of your clothing has attached to a thorny bush while you were walking by it is that you will have some trouble with getting a past deal to be respected by the other side. You might find out that the other side simply is not true to their words and that they prefer to ignore the previous arrangements that they had with you.