Red discoloration on amaryllis can be caused by any injury to the plant and does not always indicate a disease problem.
Leaf scorch causes bending of leaves and flower stalks at the point of infection. The first symptom is small, red, raised or lacerated spots in longitudinal lines. Dark, brownish red spots develop on flower parts and bulb scales. Severely infected plants produce flower stalks but they dry up before blooming. Keep the humidity down, avoid overwatering, provide plenty of light and remove infected plant parts.