Welcome back to the Forum.  Today I happened to be on when your question "popped up" and will be answering this one.  Health-related OCD is a challenge- I hope my comments will be helpful to you.  Before we get into the specific of your questions, let's put HPV in context.  In a recently published study of the prevalence of HPV about 40% of American women ages 18-59 who were sampled once had HPV of which about half were infections with so called "high risk" types (I really have trouble with the term "high risk" when nearly everyone with so-called "high risk" HPV will have those infections resolve spontaneously.  Even the term higher is an overstatement.  These terms really only fuel concerns such as yours.)  Your concerns both about HPV (in past exchanges) and HIV are excessive.  I hope and trust that you are working with a professional to manage your OCD. 

As for your specific question, transmission of HIV or other infections with a shave biopsy is unheard of.  When a shave biopsy is taken only the upper layers of the epidermis are removed, not the lower layers of skin cells or underlying tissue.  As such, what is take are dead or dying skin cells, and to take them a new, sterile, disposable scalpel is used.  In this way there is no realistic chance of transferring infection from the procedure.  I would not be concerned at all about this and hope that my comments to this effect will be helpful to you.  EWH

I can assure you that scalpels are not re-used in North America or Western Europe.  Sometimes the blades are replaced, other times the entire device is disposable but I promise you that your doctor would not use a scalpel on you that had been used on another patient.  Further, as I mentioned above, the superficial layers of skin remove with shave biopsies do not represent a manner win which HIV, hepatitis or any other infection could be introduced into you to cause infection.

I cannot comment on what sort of inspection process/credentialing is performed for private offices- just not something I deal with, sorry. 

I am quite confident that having  shave biopsy represents a no risk event for you in terms of HIV, hepatitis or other blood borne infection risk.  Congratulations on your choice to work with a therapist- Health-related OCD is a challenging problem. Please feel free to share this and my prior interactions with your therapist. 

EWH

This will be my 4th answer to your comments, one more than is called for by our guidelines.  This thread will be closed later today.

This comment is a bit redundant and may be reflecting your OCD.  You called it a shave biopsy, then called it a "regular" biopsy.  A "regular biopsy would have most likely be performed with a punch biopsy tool (again, disposable, used only on a single patient) whereas shave biopsies are taken using a scalpel.  Apparently there was no bleeding.  As I mentioned above, there is no indication, nor any scientific basis for believing that reuse of a marking pen or a scalpel used for obtaining a shave biopsy would put you at risk for HIV, hepatitis or any other blood borne infection.  Rather that worrying about such things (I realize it is difficult for you to do so), my advice would be to ask your dermatologist about your concerns.  I am confident that you will find that the scalpel used was not one that was re-used.  This being the case, you should also be confident that it was sterile when manufactured and brought to your doctor's office since such manufacturing processes are carefully regulated to insure sterility. 

I wish you the best.  I hope my comments have been helpful.  Take care.  EWH