I'm noticed that after DLC installing and making new hairstyle for Geralt, his beard don't grow anymore.
Is it some kind of bug or it's feature of that DLC? Anyway it's very disappointing :(

I've heard it's a feature, since the devs apparently thought people wouldn't want beard growth to interfere with the new looks.

Shave completely to have it grow normally.

By the way... where do I find this dlc in game ?

Closest one I found in Velen is in Oxenfurt. Enter the city, look for a scissors icon.

Does anyone had a bug that after changing hairstyles or beard the neck tattoo from Witcher 2 magically appeared??? Happened to me last night... wtf?

Shave it, I have grown beard normally. Beards are in fashion trends and grooming it with perfect and effective beard growth techniques makes beard look enriched and maintained.
beard-growth.com