Can perioral dermatitis have psycological causes? does the psycological effect worsen the condition?

Yes: Peri-oral dermatitis is felt to be due to related to hormonal changes so stress can contribute to the condition.

Could be: Psychological factors could be a factor, however, you should take multivitamin supplement just in case it is due to vitamin deficiency. Have a healthy diet, exercise 30 minutes/day, drink plenty of water, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/.