Hi my daughter have few brown spots on her right arm , inner side above the wrist . First when I took her to her pediatrician he said it looks like a bruise under the skin and it should go away 7 10days . Ten days later the spots are still there . Today I took her to see a dermatologist and she said it is caused by either lemon, celery juice . Most likely she had drops of juice on her arm before she went outside and exposed her arm to the sun.
Hi...what your dermatologist said might be true as these juices are known to cause this. But, skin conditions are best diagnosed only after seeing directly. I suggest you to upload photographs of the same on this website, so that I can guide you scientifically. Regards -