Your igs spikes are retaining old sheds probably because of low humidity.. the sheds can constrict and damage the spike which is what is going on here. You have at least 1 or 2 shed buildups. The base of the spike is the root and its possible the roots have some type of infection.
Tub bathe your ig a few times a day. Try to gently take off those old sheds.. a soft toothbrush might help. After you tube it apply antibiotic ointment it should help hold in moisture and help with the root issues. If this yellow puss stuff does not clear up in a few days off to the vets..