What could it be if having cluster of small pimples which leaves dark blotches when scratched?
Patient: Last winter I developed an itchy rash on my lower back. I treated it with hydrocortozone (.5%). The itching is gone but I am left with a large dark blotch which isn't going away even after using Neostrata lightening cream. This winter I have that same rash on upper arm and it has spread to my back. It looks like a cluster of small dry pimples moving onto my back in straight line. When I scratch it, it leaves dark blotches  that just won't go away. Doctor: I would recommend you to apply benzoyl peroxide 2.5 percent gel on the bumps twice daily and a depigmenting cream containing kojic acid on the dark spots.For itching take antihistaminic like tablet chlorpheniramine maleate once daily.