My 11 years daughter has little swelling below her...

possible causes of your daughter medical condition ?
1. acne swelling 
2. teeth gum infection 
3. lymph nodes swelling 
what to do next :
1. consult a dental doctor to do the needed tests 
2. tests including : 
- physical examination
- oral cavity test 
- blood test 
- X-ray test 
what is the possible treatment :
- topical antibiotics such as : clindamycin 
- oral antibiotics such as : cephalxine 
- surgical drainage in case of large swelling 
- conservative treatment in case of lymphnodes swelling