If the lumps are diamond shaped and have appeared quickly it could be Erysipelas which is serious and life threatening and she needs treatment asap which is normally in the form of several jabs of Pen Strep, the disease is always present in the pig but can be triggered by sudden changes in weather, feed, stress etc, all our breeding stock are jabbed against it at 6 monthly intervals, in boars it can lower fertility and in sows decrease litter sizes, aborted piglets etc. Is she in or out? It could be mange/lice etc but normally you wouldn't get such pronounced lumps, your routine worming with Dectomax/Vibramec or similar take cares mange, lice and worms..
Give your vet a ring is the order of the day....