What causes dandruff/seb derm when you move to a new place?

Climate change.: A change of climate or environment will often flare seborrheic dermatitis. Most cases can be controlled adequately with a good over-the-counter anti-seborrhea shampoo and Hydrocortisone cream. Stubborn cases require prescription products. But it will always come back and require re-treatment, because the yeast that causes it is a normal component of your skin.

Stress, climate : Moving can post many issues including stress and a change of environment. Both of these issues can lead to an exacerbation of dandruff. This is a lifelong condition that is very hard to eradicate but can be well controlled with over the counter products or if necessary, prescription grade products.