Hi,
Thank you for asking question on health care magic
you have not mentioned the exact location of the lump and whether it is associated with fever
probably you developing an
abscess if fever is present
it can be
hematoma if it has come after an injury
take an antibiotic like
erythromycin for 5 days
if no relief better consult a surgeon
Hope this answer will serve your purpose
Take care
Dr.M.V.Subrahmanyam MD;DCH
Associate professor of pediatrics