Yeah, it's nickname is "Beardruff", like dandruff.
When many of us grow a beard, the skin underneath becomes dryer, especially if you use harsh soap on it.
If you wanna grow a beard, especially a long one:
Shampoo beard every day or every other day with very mild shampoo. The curlier your beard the less often you should wash it. You can also use conditioner after shampooing.
After you've dried your beard you need to moisturize it and that will keep the skin moist as well.
The BEST thing to use is plain old 100% coconut oil, it's cheap and natural (It's in the grocery story, where the cooking oils are). It comes in solid form and melts with the heat of your skin; massage it into your hands and then your beard and into the skin. It's like magic. Then brush your beard, that draws the beard away from your face and makes the hairs more uniform.
You can also make excellent beard oil from a tablespoon of melted coconut oil and 5-10 drops of any essential oil. Keep it in a covered jar.
Depending how dry you are you may need to do it once a day or less frequently. Good luck!
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