With onset of POIS, I also developed Seb Dermatitis. Affects scalp, forehead, cheeks. Used be very severe in latter Teenage years and 20's and flared on 'O'. Also used have on Chest and thighs, and always triggered by 'O' and then any direct sun exposure.
Avoidance of both, along with anti-fungal and steroid creams has made symptoms of the Seb derm manageable now.
Not knowledgeable enough to comment on Candida.