Join Date: Dec 2010
Location: Sevierville, TN
Whatever it is, Its old and growing out. The holes appear to be abscess exit areas growing out from the coronet down just like they should. They could also be related to some injury tho as the red marks are bruising. Hard to say since you say you have only had her a few days I believe and we can't really tell how the black cut is made from these shots. But it does appear to be exit wounds from abscesses to me at this point.
The best thing you can do is keep her trimmed often so there is no overgrowth to damage the crack (babies should be looked at and re-balanced once a month during the first year since they are growing quickly, the feet are spreading fast and often get long toed and under run from not moving enough and joints are jello)
And Id also clean the holes and treat them with something make to kill fungus and yeast till it trims out. Id just scrub the holes clean with Dawn and then maybe apply some thrushbuster if I thought it was warranted and keep an eye till it was grown out.
Married to my One! 10-11-13 Steampunk style:)