3.5 Week Skin Rash: Should I seize a Second Opinion? Please Advise! Thank you!?

About 3.5 weeks ago I started to develop a slight rash along my lip rank. I didn't think anything of it until it started to seize worse by spreading along my entire upper lip and a mild burning sensation. Thus, I went to my doctor, who said that it be likely stressed induced or a allergic reaction to my thyroid medication; he adjusted my dosage and told me to apply Vaseline to the infected nouns. Well, that didn't work either; contained by fact it get worse; now my entire mouth is red, the corners of my mouth enjoy lesions and are bleeding, and it feel like razor cutting my maw, even when drinking water. Again I go to my doctor, who told me to take Vitamins C and B-complex supplements. Getting to the point, what could be wrong next to my lips (I've never have this before). Should I get a second judgment, since this is the second time I have gone to my doctor and my symptoms haven't subsided. I don't want to insult him by going over his head, but its be 3 weeks, my lips hurt, look gross, & its embarassing.

Answers:
I would turn to a dermatologist if I were you. Good Luck! I will pray for you.

Just looked this up: Perioral Dermatitis. Sounds close to it could be this.