Discovering a lump on the neck, back, or behind the ear can be alarming, especially when it appears suddenly or feels unusual. While many lumps are harmless, some may signal a health issue that needs attention. Lumps vary widely in size, texture, and cause. Some disappear on their own, while others persist, return, or slowly grow over time, making it important to understand what you’re dealing with. Knowing the possible causes can help guide care and clarify when medical advice is necessary. One of the most common explanations is an epidermoid cyst. An epidermoid cyst is a benign, noncancerous growth...
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