I'm a 24 year old male. I recently got PR, don't know how or where... but I've had it for about two weeks now. Found out about a week or so ago. My scalp had been itching for several days prior. I first noticed the bumps on my wrist then my wife noticed them on my torso region. The bumps have since migrated up and down my back, sides, legs, and upper region of my buttox. I now have them on my sholders and a few have located themselves behind my ears. The ones behind the ears itch the most. To describe the itching, it is mild and not severe. PR only gets severe itching if you use hot water, excercise alot, and sweat a great amount. Stay cool and you shouldn't itch as much.
I have found that Allegra helps the itching. I've been on Allegra 180 and Flonase for several years now due to allergies. These medications have completely eliminated any itching from insect bites (even those mosquito bites).
I also have some Caladry Clear that helps get rid of the mild itching. Aveeno helps, but use it in luke warm to cool water.
I've had this for over about two weeks now and the marks on my stomach are fading away. The ones on my back are still visible, as are the ones on my neck and behind my ears.
It should be noted, that scratching doesn't spread the spots. However, if you feel an itch in a place that doesn't have spots, you may see them appear within a few days.
According to all my research, the typical timeframe for this is 2 weeks for spots to develop and grow. Several (2-12 weeks) for the spots to remain, and 2 weeks for the spots to dissappear. UV light helps to get make the spots less noticable as well as helps the skin fight them. Just remember to use a little sunscreen.
In the meantime, your minimally contageous if at all. It is not yet known how this is spread, so continue with your daily life. PR should only occur once in your life. If its reoccuring, you may have another condition such as syphillis, Herpes Virus Type 6 or 7 (which all have similar spots to that of PR), or one of the rarest cases of PR.