I have a problem NO dermatologist has been able to help me with...so I'm hoping someone on here will be able to share my experience and lend some help!

I've had clear skin all through my teens; nothing more than a few tiny clogged pores. I'm 20 now and my skin is acting VERY strange. It started in May/March with these little raised pink bumps on my chest/back/forehead. They'd ALWAYS itch and my doctor thought it might be Staph, so I went on Keflex. Which didn't really do much. However, shortly after stopping the Keflex my chest/back cleared right up. My face however kept getting worse. It's been nearly 3 months since I haven't had clear skin and my dermatologists cannot help me.

Sometimes I just think it's acne--I mean, my forehead is covered in tiny skin-colored comedones that flatten at night and flare up during the day. Other times, strange things happen and my gut tells me it's something ELSE. Like 2 weeks ago I stayed at a certain beach house in RI and whenever I stepped foot on the sand my face broke out in bright red HUGE bumps that I've never had in my life--and never had since leaving that beach! My derm tried telling me "it's just the sun", and "you must have gotten bitten by something" but he's wrong. I know it. I've gone to this beach all my life and been fine. A month prior to going to this RI beach, I was staying at a Sarasota beach place in FL and my skin was ABSOLUTELY FINE. I can't make sense of what happened back then, but the red bumps were SO bad I cried and thought I had developed cystic acne within hours. Luckily for me, as soon as I drove home from that beach house, it all disappeared. :/ :/

So now I'm just struggling with little annoying comedones on my forehead and pink bumps on my cheeks. It's nothing bad, I don't even think it qualifies as "mild acne". But it's not what I'm used to and I'm trying to fix it--my derm prescribed my PanOxyl 10% cream wash and Tretinoin Gel .025%. HAS ANYONE EXPERIENCED ANYTHING LIKE THIS?!?!??!?!?!??