Think for a minute about the little bumps on your tongue. You probably saw a diagram of those taste bud arrangements once in a biology textbook — sweet sensors at the tip, salty on either side ...

The submandibular lymph nodes sit between the submandibular salivary glands, which are underneath the tongue, and the mandible, or lower jawbone. Occasionally one or more of the lymph nodes may be ...

Amy Revell, 17, from Stirling, developed the lump - 'like a purple ball' - under her tongue. She needed hospital treatment after the incident - but still wants her lip pierced.