Final answer:
The tiny lumps in the young girl's neck are swollen lymph nodes, which can occur when the body is fighting infections like strep throat or tonsillitis.
Step-by-step explanation:
The tiny pea-sized lumps that the young girl feels in her neck are likely swollen lymph nodes. This is a common response of the body when fighting an infection, such as a strep throat or infectious mononucleosis, which can cause inflammation of the pharynx and tonsils. Swollen lymph nodes can also occur due to other infections that affect the throat and adjacent regions like tonsillitis, where the tonsils become infected and may be covered with white patches of pus.