Swelling under one eye may be caused by allergies, fluid buildup, sinus problems, or injury. Discover key causes, symptoms, and effective treatments.

What Is a Dermoid Cyst? A dermoid cyst is an abnormal growth of non-cancerous tissue under the skin. These cysts may contain hair follicles, skin tissue, sweat, and oil. Sometimes cysts also contain ...

Water retention—also called edema or fluid retention—occurs when fluid buildup becomes trapped in the body's tissues, causing swelling. This can result in heaviness or puffiness in areas such as the ...