Firstly one has to exclude inflammatory hair conditions (LPP, discoid lupus etc...), secondly your Specialist will run a series of blood test to exclude any other problems associated with hair loss- thyroid, iron etc.. Now, once these are excluded, one may consider the diagnosis of telogen effluvium following PRP. This is usually temporary and transient, and can follow 'shock' to your system including events such as PRP to treat hair loss in the first place. Your hair will re grow again with 3-5 months, and base line pics. at 6-7 months should show an improvement. Having said that, I am only giving advice on your one line of history- a full examination and history MUST be undertaken by your specialist PRP provider. All the bestDr Davin Lim Laser and aesthetic dermatologistBrisbane, Australia.