Back story : baby had a cold and I used zarbees baby chest rub. Hours later I noticed this. Could be coincidence. I used the rub last Sunday. The mark has been there since then. Not growing or shrinking. It seems a tad bit raised. 1.5 cm diameter. Not rough. She’s had dry patches on her back and I’m using the same remedy of lotions that got rid of the dry skin on her back on this spot. Helpppp!