Hi thanks for your question.
You have pierced the ear lobe of your daughter 4 months back, and now the ear lobe is sore and bleeds on touch. She is also having lump behind the ear lobe.
Your daughter has got infection of the wound you have created while piercing the ear lobe.
The infection has spread resulting in enlargement of posterior auricular lymph
She needs a course of antibiotic and analgesic
anti inflammatory drugs (pain killer)
Hope I answered your question.