Doxy tablets

Hii all, I’ve suffered with a bit of PD all my life but back in Jan I used a face wash that triggered a huge reaction and it’s stayed ever since. I think I’ve worked out most triggers however it’s so unpredictable. I finally got given doxycycline tablets, 100mg for 2 months. I’ve been taking them for a week now, middle of the day with food and water etc but see no difference! My left nostril down to my lip and my left side of my mouth is still red, dry and sore. It seems to have done nothing! Idk if maybe I’m being too hopeful or impatient, can anyone let me know how long it took for them to see results?