Hello and hope you are doing well.
A boil has some pus, is inflamed and red and can cause pain. A sebaceous cyst is a closed sac under the skin filled with a cheese-like or oily material. They most often arise from swollen hair follicles. They are not painful, unless infected.
Hope this helped and do keep us posted.
By the way, is a sebaceous cyst or boil painful when touched?
thanks for your reply. Mom said she'll book an appointment with my pediatrician. Sorry for the late response..
It may not be related to thr urinary tract infection. The swelling could be a lymph node. It could also be a sebaceous cyst, a boil or an insect bite. Lymph node enlargement is usually due to infections like bacterial and viral. The source of infection for you appears to be on the tongue. Treatment is usually with antibiotics and anti-inflammatory medications. So, consult your primary care physician for proper clinical assessment. In the meantime for pain relief you can use OTC Tylenol (acetaminophen).
Hope this helped and do keep us posted.