There are diseases that involve the cartilage of the ear, but they are due to inflammation and are mostly only a symptom of an other disease. But the way you are describing it, it sounds more like circulation problems. Does it happen in the winter when you are going outside ?
All comments about diseases or therapies can only be a general recommendation, but do not replace a personal consultation of your doctor. Although all comments are carefully considered, they can not be the base for the introduction of medical therapies.