If the size of the lesion has reduced then it is a good sign. If there is fever and pain at the local size, then need an evalution by the nearby paediatrician. But if there is no fever and pain, then nothing needs to be done. The swelling could be because of the lymph node drain and reduction in size and pea sized sweeling is normal.

Just go for physical consultation As might be there is inflammation or hair stretch If lymph node is tender , child having fever then could be infection