my doc recommended me to use doxycycline 100 mg ( name is tab contimycin) for 3 months.. now its been 3 weeks I am using it but my skin is getting worse, so many new pimples are sprouting on my cheeks and chin and in huge number than ever before.. is it natural like I have to wait further till I see some positive results or is this medicine not fits me and I should stop using it?