"i switched to doxycycline for my acne after solodyn (which reduced the acne i was getting by about 50%). prior to taking doxycycline, i had borderline cystic acne and lots of pih/redness. within two weeks, a lot of my acne sunk into my face and went &#039;inactive.&#039; i still get about 5% of acne that i got prior to taking any medicine, but no more lingering cysts, just small pimples. i feel that doxycycline has been very effective for me, and the only side effect i have noticed some slight photosensitivity/higher chance of sunburn (this would be the case with any antibiotic). i&#039;ve been on doxycycline for almost 3 months and plan to continue taking it. now i&#039;m just dealing with pih!"