No if it has been contaminated while taking ur blood ,that time only ur supposed to get infection related with contamination.
Anyhow infection can happen with anyone at any point of time.But its not like u do something today and u will get infection related with this after couple of months/years
In ur case it is After 8 months so it is not related with prp n all.
Next Steps
consult with a good dermatologist
Health Tips
Take medicines accordingly as prescription.