Folds behind the ears may be caused by physiological factors such as aging, weight loss, or the presence of ear inflammation, cardiovascular disease, or other diseases. 1. Aging: As the elderly age, the skin in all parts of the body will sag due to the loss of collagen, and at this time, the local skin behind the ears will become more and more lax, and folds will appear. 2. Weight loss: If you have recently lost weight, the weight loss is too fast, which may lead to multiple skin laxity, appearing behind the ear with folds. 3. Ear inflammation: Inflammation behind the ears often occurs due to inadequate cleaning, which can lead to localized swelling, and the junction between the swollen area and normal tissue is more likely to cause folds. 4. Other diseases: when there are chronic wasting diseases, the body will be significantly thin, resulting in malnutrition, anemia, etc., at this time behind the ear is also prone to folds, such as tuberculosis, tumors and other diseases. It is recommended to actively treat the underlying disease and maintain good living habits. If accompanied by other uncomfortable symptoms, it is necessary to go to the hospital in time to seek medical treatment and conduct relevant examinations in order to clarify the diagnosis.