Other significant adverse effects of testosterone supplementation include acceleration of pre-existing prostate cancer growth in individuals who have undergone androgen deprivation; increased hematocrit , which can require venipuncture in order to treat; and, exacerbation of sleep apnea .  Adverse effects may also include minor side-effects such as acne and oily skin, as well as, significant hair loss and/or thinning of the hair, which may be prevented with 5-alpha reductase inhibitors ordinarily used for the treatment of benign prostatic hyperplasia , such as finasteride .  Exogenous testosterone may also cause suppression of spermatogenesis , leading to, in some cases, infertility.  It is recommended that physicians screen for prostate cancer with a digital rectal exam and prostate-specific antigen (PSA) level before starting therapy, and monitor PSA and hematocrit levels closely during therapy. 
Again, a great question for your doctor!! Discuss this with them. One very good option is always simply not to do it. You are the best one to weigh the pros and cons that your doctor lays out for you and decide what is the right decision for you. One thing that people often fail to realize is that the normal range for testosterone is that – a NORMAL RANGE. That means that readings anywhere in that range are NORMAL. If you are on the “low side of normal” – that is NORMAL. Another thing to realize is that doctors to not treat test results, they treat symptoms. Just because your testosterone comes in at 200 does not necessarily mean you need TRT! See also the below question.