<s>[INST] My three month old baby has a blister that has already popped on her shoulder the size of a quarter. It does not seem to hurt her. This morning it was slightly scabby, but still raw. I have had impetigo my whole life but I know it is not hereditary. Could this be impetigo or something else? [/INST] Hi...it could be a PUSTULE or PYODERMA or IMPETIGO. 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 - Dr. Sumanth </s>