I have two small, round bruises above and below the waist on my back. I felt them itching at first, but upon trying scratch, realized that they were sore. Later, these started aching. They continued to ache in the bed, and now my right side and leg where they lie are aching. The only thing that I have done out of the ordinary lately is use some retinol cream on my face that my daughter (pharmacy student) brought back from a medical trip to Cambodia.