There are a few things you can do to get rid of dandruff in your beard:
1. Wash your beard regularly with a gentle, anti-dandruff shampoo. This will help remove any excess oils and dead skin cells that could be contributing to the problem.
2. Use a soft bristled brush or comb to massage your scalp and distribute natural oils evenly through your hair. Doing this daily will help reduce dryness and flakiness caused by dandruff.
3. Apply an antifungal cream or lotion to your beard area once or twice per day as directed by the manufacturer’s instructions until the dandruff clears up completely
Washing your beard regularly with a gentle, anti-dandruff shampoo will help remove excess oils and dead skin cells. Use a soft bristled brush or comb to massage your scalp and distribute natural oils evenly through your hair.
Is Beard Dandruff Permanent?
If you want a permanent beard cure, you need to keep a beard care routine. A basic routine would be to wash your beard, condition it, then oil it and use your styling products. 
Why Do I Have Dry Flaky Skin Under My Beard?
Extreme weather and genetics are some of the most common causes of dry skin under beards. Beard and skin care are related. Getting rid of the dry skin under your beard can be accomplished with a regular skin care routine and daily beard care. 
Is Dandruff Permanently?
Can it be cured? It can be controlled. You will need to reserve a permanent space in your shower for the specialized treatment shampoos. The anti-dandruff ingredients slow the rate at which your skin cells die. 
Frank Harmenstein is the lead editor of the grooming website Cut Throat Straight Razor, and has over 15 years of experience in the industry. He’s personally tested and reviewed over 200 different straight razors, and has written countless articles on the subject.