Just have to get in the obligatory "your results may vary" post.
Here's a fairly comprehensive list of the changes I've had while on T that are "normal:
- Increase in hair on legs
- Loss of body fat
- Increased upper body muscle mass
- Deepening of voice
- Growth of junk
- Change of smell of junk
- Increased sex drive
- Slight facial structure change
- Slightly coarser facial fuzz
- Breast atrophy
- Slightly higher red blood cell count
- Slightly rougher facial skin
- Increased energy
- More stable mood
These are the things that have not changed, even though we're told to expect them:
- No balding or hairline changes
- No change in body acne
- No change in chest or arm hair, no back hair, no butt hair
- No adult-quality facial hair, even after a year (well, OK, I have one little baby chin hair that I shave once a month)
- No dryness of junk
- No increase in sweating
- No skin changes outside the facial area
- Can't really say much about my general body odor, since it's generally imperceptible because I don't sweat
These are the things that have changed that are completely opposite the expected changes:
- Loss of weight
- Reduced facial acne
- Lower blood pressure
- Lower bad cholesterol
- Slightly higher good cholesterol
- Reduced appetite
- Reduced abdominal fat and waist size
Basically, so far I've won the "if you could pick and choose your changes" lottery, except that I'd take some more muscle mass if I could get it, and my voice could stand to be deeper. I'm clearly an outlier, though. Most guys' acne gets worse, not better. Pretty quickly, too. Acne and voice are likely the first things you'll see, and for many of us, really the only things you can expect to see if you just go on T for a short time. For me, the first several months were really just voice, skin, genitals, and leg hair; the body shape stuff really kicked in around 6 months and has leveled off again recently.