Whhat does a doctor look for when checking the prostate with finger? is it swelling or what is it?

Here are some...: DRE(digital rectal exam) is an essential part of evaluating the concerns on prostate & its related issues such as voding, esp, in the elderly, which is done by inserting an index finger skillfully through anus into the rectum to palpate and estimate the features of prostate including its size in 2 dimensions, surface, configuration, consistnecy, etc. so to deduce possible Dx after correlated with