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Causes of tongue pain.  A minor infection on the tongue isn't uncommon, and it can cause pain and irritation. Inflamed papillae, or taste buds, are small, painful bumps that appear after an injury from a bite or irritation from hot foods. A canker sore is another common cause of pain on or under the tongue.

Fever blisters, also called cold sores, are painful infections caused by the herpes simplex virus (HSV). Blisters may show up anywhere on your body but are most likely to appear on your gums, the outside of your mouth and lips, your nose, cheeks, or fingers.

Cold Sores and Fever Blisters. Cold sores and fever blisters are caused by herpes simplex virus type 1 (HSV-1). This virus is passed from person to person by saliva (either directly, or by drinking from the same glass or cup) or by skin contact. Cold sores usually appear as clusters of tiny blisters on the lip.

Depending on what's causing your fever, additional fever signs and symptoms may include - Sweating, chills and shivering, headache, muscle aches, loss of appetite, irritability, dehydration and general weakness.

Apply Ice. This is the simplest home remedy for treating fever blisters on lips.  Lemon Balm Tea. Make lemon balm tea and soak a cotton ball. You can also use tea bag, egg, yoghurt,aloevera,baking soda and even common salt

Yellow fever is a disease caused by a virus that is spread to people by the bite of an infected mosquito.