An allergic reaction or dermatitis is always possible. Of course, many STDs and diseases are spread via the blood, so this should always be taken into account.
If there is any doubt or concern about this, using a condom should be considered.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_