rosacea
"I have been on Doxycycline for many months with amazing relief of my severe rosacea with ocular rosacea.  In the past couple of weeks I have developed an itchy rash (hives) on my scalp which spread to my whole back until I had to stop using the antibiotic this morning.  I am very upset because my rosacea symptoms were quite severe.  I gather I have developed an allergy to this wonderful drug and am at my wits' end to know what to do.  I guess I'll have to go back to my physician and hope that there's something else out there that I can take."