Hi, you asked “What is leukopenia?”
It’s a term for a low white blood count, a decrease in the disease fighting cells in your blood.
Here’s what Mayo Clinic has about this condition on their website.
https://www.mayoclinic.org/symptoms/low-white-blood-cell-count/basics/definition/sym-20050615
People with this condition are fairly susceptible to illnesses and infections. Doctors can detect this with blood tests. Has this been the case with you?