LAGirl, I think for a man’s beard it works a bit differently. A few laser places I spoke to all said for the first few treatments it should be 4 weeks apart. I told my place they’re wrong that there should be no hair left to shed at 4 weeks. I’ve done GentleLASE and Apogee Elite both on almost highest settings for the spot size used. At these settings on my underarms, forearms etc, I get pretty much 100% shedding after a few weeks. However when I’ve done my face, it’s been the same thing. The entire face is treated and hair sheds like crazy from everywhere. However it seems like I’d say only 60% of the hair actually sheds. It’s not patchy, it’s completely uniform, except on chin and upper lip where far less sheds. I then waited the 4 weeks, went back did my entire face again, and pretty much got 100% shedding, except for again areas on my chin and upper lip. Now chin and upper lip are a different animal, the hair is deeper there and it’s just harder to treat.
Either way my point is that at least in my experience on skin type 3 with 2 different Alex’s, I had the same results. My very first session I had 60% shedding or so, but I still waited 8 weeks. I then switched to Apogee from GentleLASE, once I had all the hair back. After 4 weeks only 60% again had shed, so I went again and got full shedding this time. That was actually about 6-7 weeks ago now, and the hair is only starting to come back now, I’ve barely had to shave. So from my personal experience, it seems like the first 2-3 sessions at least actually do need to be spaced 4 weeks apart. After that it seems like it comes back in line with the rest of your body. I can report back again in a few weeks when I have enough hair back for another session, but I’m definitely a believer in the every 4 weeks thing. I only pay around $70 for my entire face and neck at my clinic as I get a good deal from giving so many referrals and having so much treated, so for me paying $70 every 4 weeks anyway isn’t really a big deal.
NOW, having said that, if you are actually patchy, as in after a few weeks you can clearly see circles where hair is gone, with hair surrounding it, or you have random chunks of hair, then yes that’s definitely missed spots and you should go back. You really shouldn’t have these problems though, someone experienced in male beard removal should know how to treat the face properly.