Hello, I am a 24 y/o female with no medical problems except hypothyroidism. I take levothyroxine and at night have been taking krill oil, vitamin c, 1000 mg, a multivitamin and cranberry pills. I also took cipro a month ago for a uti. On April 15th I was out in the sun and got a nasty rash on my hands and arms, a few days later small blood blisters (I assume petechiae) appeared. Since then the rash has gone away but if I scratch my skin these petechiae appear and stay for a day then go away. I am wondering what is causing these blood blisters?