From Boericke's materia medica:

CANCER ASTACUS (Crawfish) Skin symptoms most important. URTICARIA.

Skin
Nettle-rash over whole body. Itching. Crusta lactea, with enlarged lymphatic glands. Erysipelas, and LIVER AFFECTIONS WITH NETTLE-RASH. Swelling of cervical glands. Jaundice.

Fever
Inward chilliness; very sensitive to air, worse uncovering; violent fever, with headache.

Relationship
Compare: BOMBYZ-Caterpillar-Itching of whole body. (Urticaria.) APIS; RHUS; NAT. M.; HOMAR.